fix(threat-actors): fix 500 on search + populate motivation from STIX

1. fix(search 500): func.cast(col, func.text()) is invalid SQLAlchemy —
   replaced with cast(col, Text) for both aliases and target_sectors
   JSONB columns. Generating correct CAST(col AS TEXT) SQL.

2. feat(motivation): extract primary_motivation and sophistication from
   STIX intrusion-set objects during MITRE sync. Added _normalize_motivation()
   to map STIX vocabulary → simplified frontend values (espionage / financial /
   destruction / hacktivism). Both create and update paths now set these fields.
   Run MITRE sync to backfill existing actors.

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

backend/app/services/threat_actor_import_service.py

@@ -116,6 +116,38 @@ def _extract_mitre_url(external_references: list) -> str | None:
     return None
 
 
+# Map STIX primary_motivation vocabulary → simplified frontend values
+_MOTIVATION_MAP: dict[str, str] = {
+    # Espionage / nation-state
+    "espionage":                "espionage",
+    "national-security":        "espionage",
+    "political":                "espionage",
+    # Financial
+    "financial":                "financial",
+    "financial-gain":           "financial",
+    "personal-gain":            "financial",
+    "organizational-gain":      "financial",
+    # Destruction / disruption
+    "destruction":              "destruction",
+    "disruption":               "destruction",
+    "coercion":                 "destruction",
+    "dominance":                "destruction",
+    # Hacktivism / ideology
+    "ideology":                 "hacktivism",
+    "hacktivism":               "hacktivism",
+    "notoriety":                "hacktivism",
+    "personal-satisfaction":    "hacktivism",
+    "revenge":                  "hacktivism",
+}
+
+
+def _normalize_motivation(raw: str | None) -> str | None:
+    """Normalize a STIX primary_motivation value to the Aegis vocabulary."""
+    if not raw:
+        return None
+    return _MOTIVATION_MAP.get(raw.lower().strip())
+
+
 def _parse_intrusion_sets(objects: list) -> list[dict]:
     """Parse STIX intrusion-set objects into ThreatActor dicts."""
     actors = []
@@ -139,6 +171,11 @@ def _parse_intrusion_sets(objects: list) -> list[dict]:
 
         description = obj.get("description", "")
 
+        # Extract primary_motivation and sophistication from STIX object
+        raw_motivation = obj.get("primary_motivation")
+        motivation = _normalize_motivation(raw_motivation)
+        sophistication = obj.get("sophistication")  # e.g. "advanced", "expert"
+
         # Extract references (non-MITRE)
         references = []
         for ref in ext_refs:
@@ -159,6 +196,8 @@ def _parse_intrusion_sets(objects: list) -> list[dict]:
             "references": references[:20],  # cap to avoid bloat
             "first_seen": obj.get("first_seen"),
             "last_seen": obj.get("last_seen"),
+            "motivation": motivation,
+            "sophistication": sophistication,
         })
 
     logger.info("Parsed %d intrusion-sets (threat actors)", len(actors))
@@ -275,6 +314,11 @@ def sync(db: Session) -> dict:
             db_actor.references = actor_dict["references"]
             db_actor.first_seen = actor_dict.get("first_seen")
             db_actor.last_seen = actor_dict.get("last_seen")
+            # Update enrichment fields if available
+            if actor_dict.get("motivation"):
+                db_actor.motivation = actor_dict["motivation"]
+            if actor_dict.get("sophistication"):
+                db_actor.sophistication = actor_dict["sophistication"]
             stix_to_db_actor[stix_id] = db_actor
             actors_skipped += 1
         else:
@@ -288,6 +332,8 @@ def sync(db: Session) -> dict:
                 references=actor_dict["references"],
                 first_seen=actor_dict.get("first_seen"),
                 last_seen=actor_dict.get("last_seen"),
+                motivation=actor_dict.get("motivation"),
+                sophistication=actor_dict.get("sophistication"),
                 is_active=True,
             )
             db.add(db_actor)