feat(backend): add office router and agent runtime services

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/app/services/agent_runtime/hermes_session_manager.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+import asyncio
+from dataclasses import dataclass, field
+from datetime import UTC, datetime
+from typing import Any
+
+
+@dataclass(slots=True)
+class HermesSessionHandle:
+    conversation_id: str
+    user_id: str
+    hermes_session_id: str
+    last_used_at: datetime = field(default_factory=lambda: datetime.now(UTC))
+    restart_count: int = 0
+    lock: asyncio.Lock = field(default_factory=asyncio.Lock)
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+
+class HermesSessionManager:
+    def __init__(self) -> None:
+        self._sessions: dict[str, HermesSessionHandle] = {}
+
+    def get_or_create(self, *, conversation_id: str, user_id: str) -> HermesSessionHandle:
+        handle = self._sessions.get(conversation_id)
+        if handle is None:
+            handle = HermesSessionHandle(
+                conversation_id=conversation_id,
+                user_id=user_id,
+                hermes_session_id=f"jarvis-{conversation_id}",
+            )
+            self._sessions[conversation_id] = handle
+        handle.last_used_at = datetime.now(UTC)
+        return handle
+
+
+hermes_session_manager = HermesSessionManager()