chore: scaffold the Serverpod 4 build

Deviations from a stock `serverpod create`:
- Dropped Flutter web support, for two reasons:
  - Appflowy editor had issues in the past, potentially related to the
    Flutter-Web IME bridge. Upstream has also open bugs in relation to
that:
    - AppFlowy-IO/appflowy-editor#1029 [Bug][Web] Unwanted space on click
       and overall space bugs (open)
    - AppFlowy-IO/appflowy-editor#782 [Bug] Editor auto-scrolling when
       pressing space too quickly if placed inside a scrollable (open)
  - Offline-first is a required feature. serverpod_offline_sync's SQLite
    support in browsers, maybe via sqlite3.wasm + OPFS, is not
documented.
- SDK constraints raised to ^3.13.0, instead of ^3.12.2, so enjoy the
  newest language features.
- Pinned to Flutter 3.47.4 via FVM.

Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_server/config/development.yaml

@@ -0,0 +1,76 @@
+# This is the configuration file for your local development environment. By
+# default, it runs a single server on port 8080. 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: 8080
+  publicHost: localhost
+  publicPort: 8080
+  publicScheme: http
+
+# Configuration for the Insights server.
+insightsServer:
+  port: 8081
+  publicHost: localhost
+  publicPort: 8081
+  publicScheme: http
+
+# Configuration for the web server.
+webServer:
+  port: 8082
+  publicHost: localhost
+  publicPort: 8082
+  publicScheme: http
+
+# This is the database setup for your server.
+database:
+  host: localhost
+  port: 8090
+  name: halkyon_learn
+  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
+
+# This is the setup for Redis.
+redis:
+  enabled: false
+  host: localhost
+  port: 8091
+  #user: # defaults to empty
+  #requireSsl: true # defaults to false
+
+maxRequestSize: 524288 # The maximum size of requests allowed in bytes
+
+sessionLogs:
+  persistentEnabled: true
+  consoleEnabled: true
+  consoleLogFormat: text # Defaults to "json", options are "text" or "json"
+
+# futureCallExecutionEnabled: true # Defaults to true
+
+#futureCall:
+#  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