feat: market events filters, no-auto-bootstrap, star label deoverlap

- MarketEvents: date presets (7j/30j/3m/6m/1an/Tout/Perso), instrument
  impact filter (ticker + min score + direction → auto-sort by inst score),
  sort controls (date/score/nom + asc/desc), clear-all button, count bar
- Market events list endpoint: full SQL JOIN rewrite supporting instrument
  filter, date range, origin, sort_by=instrument_score
- Disable auto-bootstrap on startup (macro/eco/categories) — manual only
- CycleActions: bootstrap group (Macro/Eco/Categories) with force checkbox,
  grouped layout (detection / bootstrap / data / ai / portfolio)
- cycle_actions router: /bootstrap-macro, /bootstrap-eco, /bootstrap-categories
  endpoints + group field on all action catalogue entries
- InstrumentChart: greedy row placement for star labels (4 rows × 20px)
  to eliminate horizontal overlap; labels now inline (★ + text)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/main.py

@@ -81,18 +81,7 @@ def startup():
     from services.geo_analyzer import GEO_PATTERNS
     from services.database import seed_builtin_patterns
     seed_builtin_patterns(GEO_PATTERNS)
-    # Bootstrap historical market events (macro/geopolitical + economic calendar)
-    try:
-        from services.macro_events_bootstrap import bootstrap_macro_events
-        from services.eco_calendar_bootstrap import bootstrap_eco_events
-        from services.impact_categories_bootstrap import bootstrap_impact_categories
-        r1 = bootstrap_macro_events()
-        r2 = bootstrap_eco_events()
-        r3 = bootstrap_impact_categories()
-        if r1.get("inserted", 0) or r2.get("inserted", 0) or r3.get("inserted", 0):
-            _log.info(f"[Startup] Bootstrapped — macro: +{r1.get('inserted',0)}, eco: +{r2.get('inserted',0)}, categories: +{r3.get('inserted',0)}")
-    except Exception as _e:
-        _log.warning(f"[Startup] Event bootstrap failed: {_e}")
+    # Auto-bootstrap désactivé — utiliser les boutons dans Cycle Actions / Timeline
     # Start auto-cycle scheduler if enabled
     from services.auto_cycle import start_scheduler
     start_scheduler()