chore: remove dead frontend code and one unused service helper

Scan of every module and exported symbol, with each candidate verified by hand
rather than trusted from the scan.

Deleted outright:
  frontend/src/lib/fundamentals.ts  (112 lines, 12 exports) — imported by
    nothing, including FundamentalsPanel, which reads backend values. It mirrors
    scoring_service._compute_fundamental_score, so it is the same *kind* of
    thing as lib/qualification.ts — but nothing consumes it, so it mirrored
    nothing and could drift out of sync unnoticed.
  Skeleton.SkeletonLine, paperTrades.getEquityCurve, regime.regimeColor
  breadth_service.compute_breadth_today — self-described "thin wrapper, for
    future live use"; that future did not arrive.

Kept, but unexported — used inside their own module, so the dead part was the
public surface, not the code: Button.Spinner, exitPlan.SETUP_STOP_ATR_MULTIPLIER,
client.ApiError.

Three things the scan flagged that are NOT dead, recorded so the next sweep does
not re-raise them:
  RegimeChart.tsx — lazy(() => import(...)) in RegimePage, so it looks orphaned
    to any importer-graph scan. Deleting it would break the risk page.
  qualification.ts MIN_TARGET_PROBABILITY / liveRiskReward — that file is a live
    mirror of app/services/qualification.py used in five places, and the
    constant is exported to document the backend value it tracks.
  ssl_bootstrap.ssl_status — called from an inline python snippet inside
    scripts/run_tier1_macbook.sh, invisible to a .py-only search.

No orphaned backend modules across app/.

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

app/services/breadth_service.py

@@ -148,11 +148,3 @@ async def compute_breadth_details(
     """Breadth values plus the qualifying-member count for snapshot metadata."""
     closes_by_symbol = await _load_universe_closes(db, symbols)
     return _breadth_with_counts(closes_by_symbol, window, min_tickers)
-
-
-async def compute_breadth_today(db: AsyncSession) -> float | None:
-    """Latest breadth reading (thin wrapper, for future live use)."""
-    series = await compute_breadth_series(db)
-    if not series:
-        return None
-    return series[max(series)]