feat: migrate chat orchestration to deep langgraph workers

app/schemas.py

@@ -41,41 +41,13 @@ class ChatContext(BaseModel):
     conversation_history: list[dict[str, Any]] = Field(default_factory=list)
 
 
-class PlanAction(BaseModel):
-    type: Literal[
-        "create_record",
-        "update_record",
-        "delete_record",
-        "index_document",
-        "send_notification",
-    ]
-    table: str | None = None
-    data: dict[str, Any] | None = None
-
-
 class ChatRequest(BaseModel):
     message: str
     context: ChatContext = Field(default_factory=ChatContext)
-    execution_mode: Literal["direct", "plan"] = "direct"
 
 
 class ChatResponse(BaseModel):
     response: str
-    actions: list[PlanAction] = Field(default_factory=list)
-
-
-# ── Execution Plans ──────────────────────────────────────────────────
-
-class PlanStep(BaseModel):
-    action: str
-    prompt_template: str | None = None
-    variables: dict[str, Any] | None = None
-    data_from_step: int | None = None
-
-
-class ExecutionPlan(BaseModel):
-    agent: str
-    steps: list[PlanStep] = Field(default_factory=list)
 
 
 # ── Backup ───────────────────────────────────────────────────────────
@@ -179,7 +151,6 @@ class WsFrameType(str, Enum):
     floating_request = "floating_request"
     stream_start = "stream_start"
     stream_text = "stream_text"
-    stream_block = "stream_block"
     stream_end = "stream_end"
     floating_domain = "floating_domain"
     data_request = "data_request"
@@ -303,21 +274,11 @@ class WsStreamText(BaseModel):
     chunk: str
 
 
-class WsStreamBlock(BaseModel):
-    """Server → Client: structured block (chart, table, entity, timeline)."""
-
-    type: Literal[WsFrameType.stream_block] = WsFrameType.stream_block
-    request_id: str
-    block_type: Literal["chart", "entity_ref", "table", "timeline"]
-    data: dict[str, Any]
-
-
 class WsStreamEnd(BaseModel):
     """Server → Client: signals end of a streaming response."""
 
     type: Literal[WsFrameType.stream_end] = WsFrameType.stream_end
     request_id: str
-    mutations: list[dict[str, Any]] = Field(default_factory=list)
 
 
 class WsFloatingDomain(BaseModel):