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>

docker-compose.yml

@@ -11,7 +11,7 @@ services:
       # To use a bind mount instead (gives direct host access to all app data):
       # - ./data:/data
     environment:
-      DATABASE_URL: "postgresql+asyncpg://${POSTGRES_USER:-fabled}:${POSTGRES_PASSWORD:-fabled}@db:5432/${POSTGRES_DB:-fabledassistant}"
+      DATABASE_URL: "postgresql+asyncpg://${POSTGRES_USER:-scribe}:${POSTGRES_PASSWORD:-scribe}@db:5432/${POSTGRES_DB:-scribe}"
       SECRET_KEY: "${SECRET_KEY:-dev-secret-change-me}"
       # Uncomment if you have a SearXNG instance you want to surface in the
       # Integrations tab as a configured web-search backend:
@@ -30,13 +30,13 @@ services:
     volumes:
       - pgdata:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: ${POSTGRES_USER:-fabled}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-fabled}
-      POSTGRES_DB: ${POSTGRES_DB:-fabledassistant}
+      POSTGRES_USER: ${POSTGRES_USER:-scribe}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-scribe}
+      POSTGRES_DB: ${POSTGRES_DB:-scribe}
     # Lenient by design: a transient host exec/healthcheck stall must never
     # escalate to killing the DB. Health here only gates app startup order.
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-fabled}"]
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-scribe}"]
       interval: 30s
       timeout: 10s
       retries: 10