feat(ai): Use Gemini 3 Pro for audit analyses (GBP, SEO, social media)

- Add per-call model override parameter to generate_text()
- GBP audit, SEO/social audit analysis, and audit content generation
  now use gemini-3-pro-preview for highest quality reasoning
- Chat and other features remain on 3-flash (cheaper, faster)

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

audit_ai_service.py

@@ -625,6 +625,7 @@ def generate_analysis(company_id: int, audit_type: str, user_id: int = None, for
             user_id=user_id,
             company_id=company_id,
             related_entity_type=f'{audit_type}_audit',
+            model='3-pro',
         )
 
         if not response_text:
@@ -812,6 +813,7 @@ Max 500 słów."""
             user_id=user_id,
             company_id=company_id,
             related_entity_type=f'audit_action_{action_type}',
+            model='3-pro',
         )
 
         if not content:

gbp_audit_service.py

@@ -1308,7 +1308,8 @@ class GBPAuditService:
                 feature='gbp_audit_ai',
                 user_id=user_id,
                 temperature=0.7,
-                max_tokens=2000
+                max_tokens=2000,
+                model='3-pro'
             )
 
             # Parse AI response

gemini_service.py

@@ -235,12 +235,13 @@ class GeminiService:
         user_id: Optional[int] = None,
         company_id: Optional[int] = None,
         related_entity_type: Optional[str] = None,
-        related_entity_id: Optional[int] = None
+        related_entity_id: Optional[int] = None,
+        model: Optional[str] = None
     ) -> str:
         """
         Generate text using Gemini API with automatic fallback, cost tracking and thinking mode.
 
-        On 429 RESOURCE_EXHAUSTED, automatically retries with the next model in fallback chain.
+        On 429/503, automatically retries with the next model in fallback chain.
 
         Args:
             prompt: Text prompt to send to the model
@@ -253,6 +254,7 @@ class GeminiService:
             company_id: Optional company ID for context
             related_entity_type: Entity type ('zopk_news', 'chat_message', etc.)
             related_entity_id: Entity ID for reference
+            model: Override model for this call (alias like '3-pro' or full name like 'gemini-3-pro-preview')
 
         Returns:
             Generated text response
@@ -260,8 +262,13 @@ class GeminiService:
         Raises:
             Exception: If API call fails on all models
         """
+        # Resolve model override: accept alias ('3-pro') or full name ('gemini-3-pro-preview')
+        primary_model = self.model_name
+        if model:
+            primary_model = GEMINI_MODELS.get(model, model)
+
         # Build ordered list of models to try: primary first, then fallbacks
-        models_to_try = [self.model_name]
+        models_to_try = [primary_model]
         for m in self.fallback_models:
             if m not in models_to_try:
                 models_to_try.append(m)