chore: decommission FMP, Finnhub and Alpha Vantage (A6)

The A5 cutover has been on and observed in production, so SEC Company Facts +
DoltHub earnings are already the live source for `fundamental_data`. This
removes everything the legacy path still occupied.

Gone: the three providers and their config/env keys; the weekly
`fundamental_collector` job; the cutover toggle (SEC + Dolt is now the
unconditional path, so `off` can no longer silently freeze scoring inputs); the
A5 parity report, whose deltas became structurally zero once the candidate
builder started writing the table it compared against; and the FMP tier of
universe bootstrap.

Two behavioral notes:

- Disabling **SEC Fundamentals Import** now stops the SEC network fetch only.
  The local cache refresh moved outside the job-enable check, because candidates
  also derive from daily closes and earnings events — freezing those on an
  ingestion pause would stale scoring with no fallback left to recover from.
- `/ingestion/fetch?sources=fundamentals` still accepts the key and reports
  `skipped`; there is no per-ticker fetch any more.

Migration 029 does not blanket-delete the leftover settings rows. Migrations run
before the service restart, and pre-A6 code reads an absent `job_*_enabled` row
as *enabled* — so the two behavior-bearing keys become tombstones pinned to safe
values (hidden in Admin) and only the inert three are deleted. Removing the
provider keys from the production `.env` is the matching rollout step.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/routers/admin.py

@@ -13,7 +13,6 @@ from app.schemas.admin import (
     AlertConfigUpdate,
     CreateUserRequest,
     DataCleanupRequest,
-    FundamentalsCutoverConfigUpdate,
     JobTriggerRequest,
     JobToggle,
     RecommendationConfigUpdate,
@@ -138,27 +137,6 @@ async def list_settings(
     )
 
 
-@router.get("/admin/settings/fundamentals-cutover", response_model=APIEnvelope)
-async def get_fundamentals_cutover_settings(
-    _admin: User = Depends(require_admin),
-    db: AsyncSession = Depends(get_db),
-):
-    config = await admin_service.get_fundamentals_cutover_config(db)
-    return APIEnvelope(status="success", data=config)
-
-
-@router.put("/admin/settings/fundamentals-cutover", response_model=APIEnvelope)
-async def update_fundamentals_cutover_settings(
-    body: FundamentalsCutoverConfigUpdate,
-    _admin: User = Depends(require_admin),
-    db: AsyncSession = Depends(get_db),
-):
-    config = await admin_service.update_fundamentals_cutover_config(
-        db, body.enabled
-    )
-    return APIEnvelope(status="success", data=config)
-
-
 @router.get("/admin/settings/recommendations", response_model=APIEnvelope)
 async def get_recommendation_settings(
     _admin: User = Depends(require_admin),
@@ -475,36 +453,6 @@ async def toggle_job(
     )
 
 
-@router.get("/admin/fundamentals-parity", response_model=APIEnvelope)
-async def get_fundamentals_parity_report(
-    _admin: User = Depends(require_admin),
-):
-    """Latest read-only A5 source/score comparison, or null before first run."""
-    return APIEnvelope(
-        status="success", data=admin_service.get_fundamentals_parity_report()
-    )
-
-
-@router.get("/admin/fundamentals-parity/csv", response_model=APIEnvelope)
-async def get_fundamentals_parity_csv(
-    _admin: User = Depends(require_admin),
-):
-    """Latest flattened A5 report for an authenticated browser download."""
-    artifact = admin_service.get_fundamentals_parity_csv()
-    data = None if artifact is None else {"filename": artifact[0], "content": artifact[1]}
-    return APIEnvelope(status="success", data=data)
-
-
-@router.get("/admin/fundamentals-parity/json", response_model=APIEnvelope)
-async def get_fundamentals_parity_json(
-    _admin: User = Depends(require_admin),
-):
-    """Canonical A5 JSON artifact for an authenticated browser download."""
-    artifact = admin_service.get_fundamentals_parity_json()
-    data = None if artifact is None else {"filename": artifact[0], "content": artifact[1]}
-    return APIEnvelope(status="success", data=data)
-
-
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