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>

Dockerfile

@@ -17,7 +17,7 @@ COPY src/ src/
 RUN --mount=type=cache,target=/root/.cache/pip \
     pip install .
 
-COPY --from=build-frontend /build/dist/ src/fabledassistant/static/
+COPY --from=build-frontend /build/dist/ src/scribe/static/
 COPY alembic.ini .
 COPY alembic/ alembic/
 
@@ -30,4 +30,4 @@ ARG BUILD_VERSION=dev
 ENV APP_VERSION=$BUILD_VERSION
 
 EXPOSE 5000
-CMD ["sh", "-c", "alembic upgrade head && hypercorn 'fabledassistant.app:create_app()' --bind 0.0.0.0:5000 --keep-alive 600"]
+CMD ["sh", "-c", "alembic upgrade head && hypercorn 'scribe.app:create_app()' --bind 0.0.0.0:5000 --keep-alive 600"]