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>

src/scribe/models/api_key.py

@@ -0,0 +1,42 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Index, Integer, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from scribe.models import Base
+from scribe.models.base import CreatedAtMixin
+
+
+class ApiKey(Base, CreatedAtMixin):
+    __tablename__ = "api_keys"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    name: Mapped[str] = mapped_column(Text, nullable=False)
+    key_hash: Mapped[str] = mapped_column(Text, nullable=False, unique=True)
+    key_prefix: Mapped[str] = mapped_column(Text, nullable=False)
+    scope: Mapped[str] = mapped_column(Text, nullable=False)  # "read" or "write"
+    last_used_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )
+    revoked_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )
+
+    __table_args__ = (
+        Index("ix_api_keys_user_id", "user_id"),
+        Index("ix_api_keys_key_hash", "key_hash"),
+    )
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "name": self.name,
+            "key_prefix": self.key_prefix,
+            "scope": self.scope,
+            "last_used_at": self.last_used_at.isoformat() if self.last_used_at else None,
+            "created_at": self.created_at.isoformat(),
+            "revoked_at": self.revoked_at.isoformat() if self.revoked_at else None,
+        }