feat(train): Halkyon Train's shell, Todo's copied and renamed (ADR 0030, D12)

apps/train with halkyon_train_server, _client and _flutter, as Todo's:
halkyon_base configured by trainBase(), its own register alone and a
member of the instance's where the operator names one, the app on
halkyon_app's gates with Train's frame, account sheet and About, texts
in British English and German that speak of workouts, app.halkyon.train
on Android, iOS, Linux, macOS and Windows.

Where it differs from Todo: development ports of its own (8180 to 8190),
so it runs beside Learn's server; one initial migration with the schema
Todo's migrations end at (the same tables, compared line by line), not
Todo's seventeen; and Todo's icon as a placeholder until the icon tool
of ADR 0031 draws Train's bike. The workspace, the licences, the READMEs
and AGENTS.md name it.

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/train/halkyon_train_server/config/development.yaml

@@ -0,0 +1,70 @@
+# This is the configuration file for your local development environment. By
+# default, it runs a single server on port 8180. 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: 8180
+  publicHost: localhost
+  publicPort: 8180
+  publicScheme: http
+
+# Configuration for the Insights server.
+insightsServer:
+  port: 8181
+  publicHost: localhost
+  publicPort: 8181
+  publicScheme: http
+
+# Configuration for the web server.
+webServer:
+  port: 8182
+  publicHost: localhost
+  publicPort: 8182
+  publicScheme: http
+
+# This is the database setup for your server.
+database:
+  host: localhost
+  port: 8190
+  name: halkyon_train
+  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