feat: 6 AI desks complets — fundamental, report, sentiment (options triggers)

- Fundamental Desk: filtre corporate news (layoffs, M&A, earnings, credit)
  avec prompt dédié + dedup sémantique
- Report Desk: wiring desk config (days, min_importance, system_prompt)
- Sentiment Desk: 5 signaux VIX/SKEW pour options lab
  (vix_level thresholds, vix_spike %, vix_term_structure, vvix_extreme, skew_extreme)
  Chaque event contient options_note actionnable (vente puts, straddles, calendar spreads)
- check_new_market_events() couvre les 6 sources, charge desk configs dynamiquement
- Signal catalog: 12 signaux (7 technical + 5 sentiment), filtrés par desk_type dans UI
- AIDesks.tsx: FundamentalConfig + ReportConfig + SignalToggle filtré par desk type
- 3 nouveaux desks seedés dans init_db (idempotent)

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

backend/routers/ai_desks.py

@@ -76,20 +76,71 @@ SIGNAL_CATALOG: List[Dict[str, Any]] = [
         "id":          "macd_crossover",
         "label":       "Croisement MACD",
         "description": "Croisement de la ligne MACD avec la ligne signal",
+        "desk_type":   "technical",
         "params": {
             "fast":   {"type": "int", "label": "EMA rapide", "default": 12, "min": 5,  "max": 30},
             "slow":   {"type": "int", "label": "EMA lente",  "default": 26, "min": 15, "max": 60},
             "signal": {"type": "int", "label": "Signal",     "default": 9,  "min": 3,  "max": 20},
         },
     },
+    # ── Sentiment signals ───────────────────────────────────────────────────
+    {
+        "id":          "vix_level",
+        "label":       "VIX — franchissement de seuil",
+        "description": "Signal quand le VIX franchit un niveau clé (20, 25, 30, 35, 45)",
+        "desk_type":   "sentiment",
+        "params": {
+            "thresholds": {"type": "multi_int", "label": "Niveaux VIX", "default": [20, 25, 30, 35, 45]},
+        },
+    },
+    {
+        "id":          "vix_spike",
+        "label":       "VIX — spike journalier",
+        "description": "VIX progresse de X% ou plus en une séance",
+        "desk_type":   "sentiment",
+        "params": {
+            "min_pct_change": {"type": "float", "label": "Variation min %", "default": 15.0, "min": 5.0, "max": 50.0},
+        },
+    },
+    {
+        "id":          "vix_term_structure",
+        "label":       "VIX — inversion structure de terme",
+        "description": "VIX9D > VIX (peur concentrée court terme)",
+        "desk_type":   "sentiment",
+        "params": {
+            "inversion_threshold": {"type": "float", "label": "Ratio VIX9D/VIX min", "default": 1.05, "min": 1.0, "max": 1.5},
+        },
+    },
+    {
+        "id":          "vvix_extreme",
+        "label":       "VVIX extrême",
+        "description": "VVIX (volatilité du VIX) dépasse un seuil",
+        "desk_type":   "sentiment",
+        "params": {
+            "threshold": {"type": "float", "label": "Seuil VVIX", "default": 100.0, "min": 80.0, "max": 150.0},
+        },
+    },
+    {
+        "id":          "skew_extreme",
+        "label":       "CBOE SKEW extrême",
+        "description": "SKEW index très haut (protection tail coûteuse) ou très bas (complaisance)",
+        "desk_type":   "sentiment",
+        "params": {
+            "low_threshold":  {"type": "float", "label": "Seuil bas",  "default": 120.0, "min": 100.0, "max": 130.0},
+            "high_threshold": {"type": "float", "label": "Seuil haut", "default": 145.0, "min": 135.0, "max": 170.0},
+        },
+    },
 ]
 
 
 # ── Schemas ───────────────────────────────────────────────────────────────────
 
+DESK_TYPES = {"news", "fundamental", "technical", "eco", "report", "sentiment"}
+
+
 class AIDeskUpsert(BaseModel):
     name:          str
-    type:          str
+    type:          str   # one of DESK_TYPES
     active:        bool = True
     system_prompt: str = ""
     instruments:   List[str] = []