feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

services/agent-filter/models.py

@@ -0,0 +1,38 @@
+from pydantic import BaseModel
+from typing import Optional, Literal
+from datetime import datetime
+
+class MessageCreatedEvent(BaseModel):
+    channel_id: str
+    message_id: Optional[str] = None
+    matrix_event_id: str
+    sender_id: str
+    sender_type: Literal["human", "agent"]
+    microdao_id: str
+    created_at: datetime
+
+class FilterDecision(BaseModel):
+    channel_id: str
+    message_id: Optional[str] = None
+    matrix_event_id: str
+    microdao_id: str
+    decision: Literal["allow", "deny", "modify"]
+    target_agent_id: Optional[str] = None
+    rewrite_prompt: Optional[str] = None
+
+class ChannelContext(BaseModel):
+    microdao_id: str
+    visibility: Literal["public", "private", "microdao"]
+    allowed_agents: list[str] = []
+    disabled_agents: list[str] = []
+
+class FilterContext(BaseModel):
+    channel: ChannelContext
+    sender_is_owner: bool = False
+    sender_is_admin: bool = False
+    sender_is_member: bool = True
+    local_time: Optional[datetime] = None
+
+
+
+