chore(db): remove db/connectors backwards-compat symlink (#568)

Remove the db/connectors → tooling/db/ symlink added in Sprint 21
(#274) and migrate all references to use tooling/db/ directly.

- Delete tracked symlink from db/connectors
- Remove duplicate db/connectors/* permission patterns from settings
- Update project-structure.md to reflect removal
- Move whatsinagame/static/db/connectors/ to whatsinagame/static/tooling/db/
- Update 20 whatsinagame template, skill, and test files
- Update comment references in client/tests/test_anti_tedium.gd
- Historical docs (old sprint briefings, changelog, discussions) left as-is

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

whatsinagame/static/db/schema.sql

@@ -1,5 +1,5 @@
 -- Project Ticketing Database Schema
--- Access via: python3 db/connectors/sqlite_connector.py <command>
+-- Access via: python3 tooling/db/sqlite_connector.py <command>
 -- DO NOT use sqlite3 CLI (crashes in Claude Code due to std::bad_alloc bug)
 
 PRAGMA journal_mode=WAL;