redesign activation gate to expected value + make pipelines cron-configurable

Diagnosing "no qualified signals for 5 days": setups were generated but none
qualified. The gate required BOTH a high min_rr (2.0) AND a high
min_target_probability (60), which became contradictory after the Jun-15
probability recalibration — probability already embeds R:R via the 1/(rr+1) ruin
term, so high-R:R targets are inherently low-probability and nothing cleared both.

Gate is now expected value (R): p*rr - (1-p) from the primary target's
probability. R:R and confidence stay as floors; high-conviction / exclude-conflicts
/ min-target-probability become optional tighteners (default off). Defaults:
min_expected_value=0.15, min_rr=1.2, min_confidence=55. EV is only enforced when
computable. Migration 009 clears stored activation_* rows so the new defaults
apply. Backtest sweeps min_expected_value instead of target probability.

Scheduling: pipelines are now cron-configurable in Admin -> Jobs. daily_pipeline
(full, default 0 7 * * *) plus a new light intraday_pipeline (OHLCV + outcome eval,
default hourly US session) that keeps prices/live-R:R current without setup churn.
Fundamentals on its own early weekly cron. Timezone configurable (default
Europe/Berlin). Moving interval->CronTrigger also fixes the restart-deferral bug
where an interval job's countdown resets on every process restart.

319 backend unit tests pass; frontend tsc clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/routers/admin.py

@@ -15,6 +15,7 @@ from app.schemas.admin import (
     DataCleanupRequest,
     JobToggle,
     RecommendationConfigUpdate,
+    ScheduleConfigUpdate,
     SentimentConfigUpdate,
     SentimentTestRequest,
     PasswordReset,
@@ -176,6 +177,28 @@ async def update_activation_settings(
     return APIEnvelope(status="success", data=updated)
 
 
+@router.get("/admin/settings/schedule", response_model=APIEnvelope)
+async def get_schedule_settings(
+    _admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    config = await admin_service.get_schedule_config(db)
+    return APIEnvelope(status="success", data=config)
+
+
+@router.put("/admin/settings/schedule", response_model=APIEnvelope)
+async def update_schedule_settings(
+    body: ScheduleConfigUpdate,
+    _admin: User = Depends(require_admin),
+    db: AsyncSession = Depends(get_db),
+):
+    updated = await admin_service.update_schedule_config(
+        db,
+        body.model_dump(exclude_unset=True, exclude_none=True),
+    )
+    return APIEnvelope(status="success", data=updated)
+
+
 @router.get("/admin/settings/sentiment", response_model=APIEnvelope)
 async def get_sentiment_settings(
     _admin: User = Depends(require_admin),