refactor: rename package fabledassistant -> scribe (code-only)

Renames src/fabledassistant -> src/scribe and all imports, plus the
default DB name and DB user/password (fabled -> scribe) in config +
compose. 952 refs / 154 files. Reverses the old 'internal name stays
fabledassistant' convention.

Code-only: live databases are still physically named 'fabledassistant'.
Deployed environments must set POSTGRES_DB / POSTGRES_USER (or rename the
DB) since the defaults now resolve to 'scribe'. Repo (FabledScribe), git
host (fabledsword), MCP (fabled-git) and the image name (fabledscribe)
are intentionally unchanged.

ruff check src/ clean locally; CI (typecheck + pytest) is the gate.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_events_model.py

@@ -1,12 +1,12 @@
 def test_event_model_has_new_columns():
-    from fabledassistant.models.event import Event
+    from scribe.models.event import Event
     cols = {c.key for c in Event.__table__.columns}
     assert "caldav_uid" in cols
     assert "color" in cols
 
 
 def test_event_to_dict_includes_new_fields():
-    from fabledassistant.models.event import Event
+    from scribe.models.event import Event
     from datetime import datetime, timezone
     e = Event(
         user_id=1, uid="test-uid", title="Test",
@@ -21,6 +21,6 @@ def test_event_to_dict_includes_new_fields():
 def test_caldav_create_event_accepts_uid_param():
     """caldav.create_event signature must accept an optional uid param."""
     import inspect
-    from fabledassistant.services.caldav import create_event
+    from scribe.services.caldav import create_event
     sig = inspect.signature(create_event)
     assert "uid" in sig.parameters