feat(meditate): Meditate's server, its sealed tables, and SimpleLogin's way back to it

halkyon_meditate_server and its generated client, copied from Todo's
and stripped to the module, the register and the sync engine (ADR 0038,
D1, D7): content_key, meditate_settings and sitting, synced and sealed,
each indexing spaceId and deleted with the person's space; two
migrations, the initial one and sittings (purely additive, the ADR
explains the SQL); ports 8280 to 8282 and PostgreSQL 8290 (D13).
Tests: the module's basics naming `meditate`, the sync engine refusing
calls without a session, the register's modes, and a person's deletion
taking their rows alone.

halkyon_base's forwarding page knows Meditate's ways back
(meditate-loopback on 43826, meditate-scheme app.halkyon.meditate),
which halkyon_app's repository names among the apps' ports.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/meditate/halkyon_meditate_server/config/development.yaml

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+# This is the configuration file for your local development environment. By
+# default, it runs a single server on port 8280. To set up your server, you will
+# need to add the name of the database you are connecting to and the user name.
+# The password for the database is stored in the config/passwords.yaml.
+#
+# When running your server locally, the server ports are the same as the public
+# facing ports.
+
+# Configuration for the main API server.
+apiServer:
+  port: 8280
+  publicHost: localhost
+  publicPort: 8280
+  publicScheme: http
+
+# Configuration for the Insights server.
+insightsServer:
+  port: 8281
+  publicHost: localhost
+  publicPort: 8281
+  publicScheme: http
+
+# Configuration for the web server.
+webServer:
+  port: 8282
+  publicHost: localhost
+  publicPort: 8282
+  publicScheme: http
+
+# This is the database setup for your server.
+database:
+  host: localhost
+  port: 8290
+  name: halkyon_meditate
+  user: postgres
+  #requireSsl: true # defaults to false
+  #isUnixSocket: true # defaults to false
+  dataPath: .serverpod/development/pgdata
+  #maxConnectionCount: 10 # Defaults to 10, a negative or null value removes the limit
+
+
+maxRequestSize: 524288 # The maximum size of requests allowed in bytes
+
+# Session logs stay out of the database, for privacy, as Learn's (never re-enable).
+sessionLogs:
+  persistentEnabled: false
+  consoleEnabled: true
+  consoleLogFormat: text # Defaults to "json", options are "text" or "json"
+
+#futureCall:
+#  enabled: true # Defaults to true, set to false to disable scheduling and running future calls
+#  executionEnabled: true # Defaults to true
+#  concurrencyLimit: 1 # Defaults to 1, a negative or null value removes the limit
+#  scanInterval: 5000 # Unit in milliseconds, defaults to 5000
+
+# Recommended when serving web clients: keeps auth tokens in httpOnly
+# cookies. Without this, web tokens live in JavaScript-readable storage,
+# where any XSS can steal them. Web clients opt in with
+# `client.cookieAuth = true`. Requires `allowedOrigins`; browsers from
+# origins not in the list lose cross-origin access, including to public
+# endpoints.
+#authCookie:
+#  secure: false # Cookies require https; relax only for http://localhost
+#  #name: serverpod_auth # Defaults to "serverpod_auth"
+#  #refreshName: serverpod_auth_refresh # Defaults to "<name>_refresh"
+#  #domain: example.com # Defaults to host-only; set to share across subdomains
+#  #path: / # Defaults to "/"
+#  #sameSite: lax # Defaults to "lax", options are "strict" or "none"
+#allowedOrigins:
+#  - http://localhost:8082 # The origin serving your Flutter web app

apps/meditate/halkyon_meditate_server/config/generator.yaml

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+type: server
+
+client_package_path: ../halkyon_meditate_client
+server_test_tools_path: test/integration/test_tools
+
+# Private data sync through serverpod_offline_sync (ADR 0001, ADR 0038's D7): its
+# module, and the experimental `database: sync` for the models it syncs.
+modules:
+  serverpod_offline_sync:
+    nickname: offline_sync
+  # What every Halkyon server has (ADR 0014): `client.modules.base` in the app.
+  halkyon_base:
+    nickname: base
+
+experimental_features:
+  databaseSync: true

apps/meditate/halkyon_meditate_server/config/staging.yaml

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+# This is the configuration file for your staging environment. The staging
+# environment is meant to resemble the production environment as much as
+# possible and may connect to production databases services and data. You use it
+# for final testing before deploying the production server.
+#
+# Typically, you will want to route the traffic through a load balancer
+# which adds SSL security through https. If you use Serverpod's standard
+# Terraform scripts to deploy your server, all you need to change in
+# this file is the examplepod.com domain name.
+
+# Configuration for the main API server.
+apiServer:
+  port: 8080
+  publicHost: api-staging.examplepod.com
+  publicPort: 443
+  publicScheme: https
+
+# Configuration for the Insights server.
+insightsServer:
+  port: 8081
+  publicHost: insights-staging.examplepod.com
+  publicPort: 443
+  publicScheme: https
+
+# Configuration for the web server.
+webServer:
+  port: 8082
+  publicHost: app-staging.examplepod.com
+  publicPort: 443
+  publicScheme: https
+
+# This is the database setup for your servers. The default for the Google Cloud
+# Engine Terraform configuration is to connect on a private IP address.
+# If you are connecting on a public IP (e.g. on AWS or Google Cloud Run), you
+# connect on the public IP of the database e.g. database-staging.examplepod.com.
+database:
+  host: database.private-staging.examplepod.com
+  port: 5432
+  name: serverpod
+  user: postgres
+  requireSsl: true
+  #isUnixSocket: true # defaults to false
+  #maxConnectionCount: 10 # Defaults to 10, a negative or null value removes the limit
+
+
+maxRequestSize: 524288 # The maximum size of requests allowed in bytes
+
+# Session logs stay out of the database, for privacy, as Learn's (never re-enable).
+sessionLogs:
+  persistentEnabled: false
+# consoleEnabled: true
+# consoleLogFormat: json # Defaults to "json", options are "text" or "json"
+
+#futureCall:
+#  enabled: true # Defaults to true, set to false to disable scheduling and running future calls
+#  executionEnabled: true # Defaults to true
+#  concurrencyLimit: 1 # Defaults to 1, a negative or null value removes the limit
+#  scanInterval: 5000 # Unit in milliseconds, defaults to 5000
+
+# Recommended when serving web clients: keeps auth tokens in httpOnly
+# cookies. Without this, web tokens live in JavaScript-readable storage,
+# where any XSS can steal them. Web clients opt in with
+# `client.cookieAuth = true`. Requires `allowedOrigins`; browsers from
+# origins not in the list lose cross-origin access, including to public
+# endpoints.
+#authCookie:
+#  sameSite: lax # Defaults to "lax", options are "strict" or "none"
+#  #name: serverpod_auth # Defaults to "serverpod_auth"
+#  #refreshName: serverpod_auth_refresh # Defaults to "<name>_refresh"
+#  #domain: examplepod.com # Defaults to host-only; set to share across subdomains
+#  #path: / # Defaults to "/"
+#  #secure: true # Defaults to true; the cookie is only sent over https
+#allowedOrigins:
+#  - https://app-staging.examplepod.com # The origin serving your Flutter web app

apps/meditate/halkyon_meditate_server/config/test.yaml

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+# This is the configuration file for your test environment.
+# All ports are set to zero in this file which makes the server find the next available port.
+# This is needed to enable running tests concurrently. To set up your server, you will
+# need to add the name of the database you are connecting to and the user name.
+# The password for the database is stored in the config/passwords.yaml.
+#
+# When running your server locally, the server ports are the same as the public
+# facing ports.
+
+# Configuration for the main API test server.
+apiServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# Configuration for the Insights test server.
+insightsServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# Configuration for the web test server.
+webServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# This is the database setup for your test server.
+database:
+  host: localhost
+  port: 9090
+  name: halkyon_meditate_test
+  user: postgres
+  dataPath: .serverpod/test/pgdata
+  #maxConnectionCount: 10 # Defaults to 10, a negative or null value removes the limit
+
+
+# Session logs stay out of the database, for privacy, as Learn's (never re-enable).
+sessionLogs:
+  persistentEnabled: false
+  consoleEnabled: true
+# consoleLogFormat: json # Defaults to "json", options are "text" or "json"
+
+#futureCall:
+#  enabled: true # Defaults to true, set to false to disable scheduling and running future calls
+#  executionEnabled: true # Defaults to true
+#  concurrencyLimit: 1 # Defaults to 1, a negative or null value removes the limit
+#  scanInterval: 5000 # Unit in milliseconds, defaults to 5000