Initial commit: CI Agent competitive-intelligence monitoring app

FastAPI + Celery + Next.js + Postgres/Redis app with company monitoring,
source collection, LLM-based change analysis, enrichment, and account
security (Turnstile, escalating lockout, email verification).

apps/api/app/services/snapshot_service.py

@@ -0,0 +1,20 @@
+"""Read-only snapshot history for a company. Snapshots themselves are only
+ever written by collection_service.py during a monitoring run - this module
+just lists what's already there, ownership-checked."""
+
+from __future__ import annotations
+
+import uuid
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.snapshot import Snapshot
+from app.repositories.source_repository import SnapshotRepository
+from app.services import company_service
+
+
+async def list_snapshots(
+    db: AsyncSession, user_id: uuid.UUID, company_id: uuid.UUID
+) -> list[Snapshot]:
+    await company_service.get_company(db, user_id, company_id)
+    return await SnapshotRepository(db).list_for_company(company_id)