Add is_internal flag to HolmesChat schemas

Optional boolean alongside the other chat-analytics fields (request_source,
conversation_id, etc.) so the FE can mark internal/test traffic and the
Holmes server can filter it out of usage dashboards.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: alonelish

src/robusta/core/model/base_params.py

@@ -212,6 +212,7 @@ class HolmesChatParams(HolmesParams):
     source_ref: Optional[str] = None
     conversation_id: Optional[str] = None
     conversation_source: Optional[str] = None
+    is_internal: Optional[bool] = None
     meta: Optional[Dict[str, Any]] = None
 
     class Config:

src/robusta/core/reporting/holmes.py

@@ -56,6 +56,7 @@ class HolmesChatRequest(BaseModel):
     source_ref: Optional[str] = None
     conversation_id: Optional[str] = None
     conversation_source: Optional[str] = None
+    is_internal: Optional[bool] = None
     meta: Optional[Dict[str, Any]] = None
 
     class Config: