halkyon_base: a Serverpod module for sign-in, accounts and instance basics

What every Halkyon server has, taken from Halkyon Learn's: anonymous,
GitHub and email-code sign-in with their endpoints, an account's ways
in and its deletion, the pruning of abandoned anonymous people, of
sign-up attempts and of expired codes, and the instance's basics (the
sign-in ways offered, the source link, the minimum app build, where
people's data and its backups are). Endpoints sit under the nickname
`base`. A host configures it in one place before its pod starts: its
name for the mails, its source link, its minimum build, and hooks that
delete its own data with a person.

The tables keep Learn's names, columns and indexes, so a host moving
onto the module migrates nothing but version rows. Server package under
the SSPL, client under the AGPL, as Learn's are.

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

packages/halkyon_base_server/analysis_options.yaml

@@ -0,0 +1,22 @@
+# 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
+
+# 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 ("requires
+# the 'primary-constructors' language feature"; checked with v4.0.4). So the module
+# keeps the classic constructor and class-body syntax, as the Halkyon servers do;
+# 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