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/milestone.py

@@ -0,0 +1,30 @@
+from sqlalchemy import ForeignKey, Integer, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from scribe.models import Base
+from scribe.models.base import TimestampMixin, SoftDeleteMixin
+
+
+class Milestone(Base, TimestampMixin, SoftDeleteMixin):
+    __tablename__ = "milestones"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"))
+    project_id: Mapped[int] = mapped_column(Integer, ForeignKey("projects.id", ondelete="CASCADE"))
+    title: Mapped[str] = mapped_column(Text, default="")
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(Text, default="active")
+    order_index: Mapped[int] = mapped_column(Integer, default=0)
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "user_id": self.user_id,
+            "project_id": self.project_id,
+            "title": self.title,
+            "description": self.description,
+            "status": self.status,
+            "order_index": self.order_index,
+            "created_at": self.created_at.isoformat(),
+            "updated_at": self.updated_at.isoformat(),
+        }