feat(todo): the server on halkyon_base

Todo's server includes halkyon_base (ADR 0014), configured for Todo:
its basics say it serves `todo`, sign-in mails name Halkyon Todo, the
source is this repository, minimumAppBuild 1. Authentication through
the module (anonymous, GitHub, email codes, server-side sessions) in
place of the scaffold's email-and-password provider; the module's
pruning scheduled once however often the server starts. The scaffold's
greeting, its Flutter web hosting, cloud storage and Docker files go;
session logs are never persisted. Todo was never deployed, so its
migrations start again with one initial migration. The root's lints
apply, with the four constructor rules off as on Learn's server.

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/todo/halkyon_todo_server/analysis_options.yaml

@@ -1,34 +1,21 @@
-# This file configures the static analysis results for your project (errors,
-# warnings, and lints).
-#
-# This enables the 'recommended' set of lints from `package:lints`.
-# This set helps identify many issues that may lead to problems when running
-# or consuming Dart code, and enforces writing Dart using a single, idiomatic
-# style and format.
-#
-# If you want a smaller set of lints you can change this to specify
-# 'package:lints/core.yaml'. These are just the most critical lints
-# (the recommended set includes the core lints).
-# The core lints are also what is used by pub.dev for scoring packages.
-
-include: package:lints/recommended.yaml
-
-# Uncomment the following section to specify additional rules.
-
-linter:
-  rules:
-    unawaited_futures: true
-    avoid_print: true
+# The workspace's lint rules (see ../../../analysis_options.yaml), minus generated code.
+include: ../../../analysis_options.yaml
 
 analyzer:
   exclude:
     - lib/src/generated/**
     - test/integration/test_tools/serverpod_test_tools.dart
-# For more information about the core and recommended set of lints, see
-# https://dart.dev/go/core-lints
 
-# For additional information about configuring this file, see
-# https://dart.dev/guides/language/analysis-options
+# Serverpod's code generator reads this package with an analyzer that doesn't know
+# Dart v3.13's primary constructors yet, and fails on them in endpoint files, so the
+# server keeps the classic constructor and class-body syntax, as Learn's does; switch
+# these back on once Serverpod parses it.
+linter:
+  rules:
+    empty_container_bodies: false
+    unnecessary_type_name_in_constructor: false
+    use_declaring_parameters: false
+    use_primary_constructors: false
 
 formatter:
   trailing_commas: preserve