refactor(logging): 🔨 adjust logging levels and improve schema cleaning for Antigravity

- Change reasoning parameters log from info to debug level in main.py
- Move reasoning parameters logging outside logger conditional block for consistent monitoring
- Enhance _clean_claude_schema documentation to clarify it's for Antigravity/Google's Proto-based API
- Add support for converting 'const' to 'enum' with single value in schema cleaning
- Improve code organization with better comments explaining unsupported fields

These changes improve logging granularity and enhance JSON Schema compatibility with Antigravity's Proto-based API requirements.

src/proxy_app/main.py

@@ -672,15 +672,15 @@ async def chat_completions(
         if logger:
             logger.log_request(headers=request.headers, body=request_data)
 
-            # Extract and log specific reasoning parameters for monitoring.
-            model = request_data.get("model")
-            generation_cfg = request_data.get("generationConfig", {}) or request_data.get("generation_config", {}) or {}
-            reasoning_effort = request_data.get("reasoning_effort") or generation_cfg.get("reasoning_effort")
-            custom_reasoning_budget = request_data.get("custom_reasoning_budget") or generation_cfg.get("custom_reasoning_budget", False)
-
-            logging.getLogger("rotator_library").info(
-                f"Handling reasoning parameters: model={model}, reasoning_effort={reasoning_effort}, custom_reasoning_budget={custom_reasoning_budget}"
-            )
+        # Extract and log specific reasoning parameters for monitoring.
+        model = request_data.get("model")
+        generation_cfg = request_data.get("generationConfig", {}) or request_data.get("generation_config", {}) or {}
+        reasoning_effort = request_data.get("reasoning_effort") or generation_cfg.get("reasoning_effort")
+        custom_reasoning_budget = request_data.get("custom_reasoning_budget") or generation_cfg.get("custom_reasoning_budget", False)
+
+        logging.getLogger("rotator_library").debug(
+            f"Handling reasoning parameters: model={model}, reasoning_effort={reasoning_effort}, custom_reasoning_budget={custom_reasoning_budget}"
+        )
 
         # Log basic request info to console (this is a separate, simpler logger).
         log_request_to_console(

src/rotator_library/providers/antigravity_provider.py

@@ -186,15 +186,27 @@ def _recursively_parse_json_strings(obj: Any) -> Any:
 
 
 def _clean_claude_schema(schema: Any) -> Any:
-    """Recursively remove fields that Claude's JSON Schema validation doesn't support."""
+    """
+    Recursively clean JSON Schema for Antigravity/Google's Proto-based API.
+    - Removes unsupported fields ($schema, additionalProperties, etc.)
+    - Converts 'const' to 'enum' with single value (supported equivalent)
+    """
     if not isinstance(schema, dict):
         return schema
     
-    incompatible = {'$schema', 'additionalProperties', 'minItems', 'maxItems', 'pattern'}
+    # Fields not supported by Antigravity/Google's Proto-based API
+    incompatible = {
+        '$schema', 'additionalProperties', 'minItems', 'maxItems', 'pattern',
+    }
     cleaned = {}
     
+    # Handle 'const' by converting to 'enum' with single value
+    if 'const' in schema:
+        const_value = schema['const']
+        cleaned['enum'] = [const_value]
+    
     for key, value in schema.items():
-        if key in incompatible:
+        if key in incompatible or key == 'const':
             continue
         if isinstance(value, dict):
             cleaned[key] = _clean_claude_schema(value)