Add multi-factor conviction gate to activation

Make "qualified" mean an edge candidate, not just R:R + confidence.
The gate now also requires (all admin-configurable, defaults on):
- high conviction: recommended_action LONG_HIGH / SHORT_HIGH only
- clean read: risk_level Low (no contradicting signals)
- probable primary target: best target probability >= min (default 60)

- Shared predicate: app/services/qualification.py +
  frontend/src/lib/qualification.ts (mirrored)
- Activation config extended (min_target_probability,
  require_high_conviction, exclude_conflicts) with bool-aware
  get/update + validation
- /trades/performance switched to ?qualified_only=true, applying
  the full gate server-side; confidence breakdown stays unfiltered
- Dashboard "Qualified", Signals "Qualified only" toggle, and
  Track Record all use the one gate; Admin gains the new controls

Sentiment provider runtime config (prior change) included.

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

app/routers/ingestion.py

@@ -23,8 +23,8 @@ from app.models.ticker import Ticker
 from app.models.user import User
 from app.providers.alpaca import AlpacaOHLCVProvider
 from app.providers.fundamentals_chain import build_fundamental_provider_chain
-from app.providers.openai_sentiment import OpenAISentimentProvider
 from app.services.rr_scanner_service import scan_ticker
+from app.services.sentiment_provider_service import build_sentiment_provider
 from app.schemas.common import APIEnvelope
 from app.services import (
     fundamental_service,
@@ -99,11 +99,14 @@ async def fetch_symbol(
         sources["ohlcv"] = {"status": "error", "records": 0, "message": str(exc)}
 
     # --- Sentiment ---
-    if settings.openai_api_key:
+    try:
+        sent_provider = await build_sentiment_provider(db)
+    except ProviderError as exc:
+        sent_provider = None
+        sources["sentiment"] = {"status": "skipped", "message": str(exc)}
+
+    if sent_provider is not None:
         try:
-            sent_provider = OpenAISentimentProvider(
-                settings.openai_api_key, settings.openai_model
-            )
             data = await sent_provider.fetch_sentiment(symbol_upper)
             await sentiment_service.store_sentiment(
                 db,
@@ -124,11 +127,6 @@ async def fetch_symbol(
         except Exception as exc:
             logger.error("Sentiment fetch failed for %s: %s", symbol_upper, exc)
             sources["sentiment"] = {"status": "error", "message": str(exc)}
-    else:
-        sources["sentiment"] = {
-            "status": "skipped",
-            "message": "OpenAI API key not configured",
-        }
 
     # --- Fundamentals ---
     if settings.fmp_api_key or settings.finnhub_api_key or settings.alpha_vantage_api_key: