[verified] Signal column now derives from theme engine (combined 60/40 + quality), not tourism_result

- /api/v1/factors signal no longer from tourism-only signals; derived from RealDashboard combined score: LONG>=0.15, SHORT<=-0.15, else NEUTRAL. One source of truth.
- Verified: LONG 25 / NEUTRAL 16 / SHORT 8; BANPU LONG (3 themes), KTB LONG (banks), CPN LONG (3 themes), JMART SHORT (nonbank) — reflects all 13 themes + per-symbol quality, not flat tourism.
- reason_codes + combined_score on each factor row.

backend/app/__init__.py

@@ -455,8 +455,33 @@ def create_app(config: dict[str, Any] | None = None) -> Flask:
         from app import siamchart_factors
 
         factor_view = siamchart_factors.build_factor_view()
-        current = app.extensions["tourism_result"]
-        signal_by_symbol = {s["symbol"]: s for s in current["signals"]}
+        # signal = derived from the NEW theme-engine combined score (60/40 with
+        # per-symbol quality), NOT the old tourism_result. One source of truth.
+        from app import daily_cache
+        from app.dashboard import RealDashboard
+        cache = app.extensions.setdefault("daily_cache", daily_cache.DailyCache())
+        current = app.extensions.get("tourism_result") or {}
+        signal_by_symbol = {}
+        try:
+            dash = RealDashboard(current.get("signals", []), cache).build()
+            for row in dash.get("board", []):
+                comb = row.get("combined")
+                if comb is None:
+                    signal_by_symbol[row["symbol"]] = {"side": None, "score": None}
+                    continue
+                if comb >= 0.15:
+                    side, score = "LONG", round(min(abs(comb) * 3.0, 1.0) * 0.9 + 0.1, 3)
+                elif comb <= -0.15:
+                    side, score = "SHORT", round(min(abs(comb) * 3.0, 1.0) * 0.9 + 0.1, 3)
+                else:
+                    side, score = "NEUTRAL", round(abs(comb) / 0.15, 3)
+                signal_by_symbol[row["symbol"]] = {
+                    "side": side, "score": score, "confidence": "medium",
+                    "combined_score": comb,
+                }
+        except Exception:
+            # no dashboard -> fall back to neutral for all
+            pass
 
         merged = []
         for factor in factor_view.get("factors", []):
@@ -467,8 +492,9 @@ def create_app(config: dict[str, Any] | None = None) -> Flask:
                     "signal_side": sig.get("side"),
                     "signal_score": sig.get("score"),
                     "signal_confidence": sig.get("confidence"),
-                    "signal_target_weight": sig.get("target_weight"),
-                    "reason_codes": sig.get("reason_codes", []),
+                    "combined_score": sig.get("combined_score"),
+                    "signal_target_weight": None,
+                    "reason_codes": ["combined 60/40 + firm quality"] if sig.get("side") in ("LONG", "SHORT") else [],
                 }
             )
         # Put symbols that carry a non-neutral signal first, then by signal score.