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>

client/tests/test_anti_tedium.gd

@@ -250,7 +250,7 @@ func test_gauntlet_ui_stays_hidden_after_multiple_snapshots() -> void:
 
 # -- GauntletHUD Feature Tests (#496) ----------------------------------------
 # Timer lifecycle, personal bests, room change, visibility.
-# Spec: sprint-9/client.md #496. Ticket: db/connectors/ticket show 496.
+# Spec: sprint-9/client.md #496. Ticket: tooling/db/ticket show 496.
 
 func test_format_time_zero() -> void:
 	# Static utility: 0 seconds → "00:00"
@@ -476,7 +476,7 @@ func test_gauntlet_snapshot_roundtrip_via_apply() -> void:
 
 # -- BugReportDialog Feature Tests (#495) ------------------------------------
 # Pause/unpause lifecycle, wire guard, text render, state machine.
-# Spec: sprint-9/client.md #495. Ticket: db/connectors/ticket show 495.
+# Spec: sprint-9/client.md #495. Ticket: tooling/db/ticket show 495.
 
 func test_bug_report_sends_pause_on_open() -> void:
 	# start_capture() must send Pause to the server.