Security fixes: P0-P2 complete (22 fixes)

P0 (7): Auth-bypass removed, migrations fixed, plugin-upload disabled, RLS FORCE+WITH CHECK, plugin double-registration fixed, persistent volume, domain removed
P1 (11): User/tenant model, Redis centralized, worker separated, transactional outbox, XSS fixed, DMS chunked streaming, permissions unified, password reset, metrics secured, config/docs fixed, cross-tenant FK
P2 (4): Contact model normalized, cross-imports reduced 94%, commands+state machines for contacts/dms/mail/calendar, SPA path-traversal

8 new migrations, 99 unit tests, 13 commands, 8 contracts, 72 files changed

app/plugins/builtins/automation/agent_comm.py

@@ -55,8 +55,8 @@ async def send_agent_message(
 
     # 2. Create a kommunikation message in a dedicated agent room
     try:
-        from app.plugins.builtins.kommunikation.models import Message, Room
-        from app.plugins.builtins.kommunikation.services import RoomService
+        from app.plugins.builtins.kommunikation.contracts import Message, Room
+        from app.plugins.builtins.kommunikation.contracts import RoomService
 
         # Find or create the agent-to-agent room
         room_name = f"agent:{from_agent_id}:{target_agent.id}"
@@ -129,7 +129,7 @@ async def send_agent_message(
 
 def register_agent_comm_tool():
     """Register the send_agent_message tool in the global tool registry."""
-    from app.plugins.builtins.ai_assistant.tool_registry import get_tool_registry
+    from app.plugins.builtins.ai_assistant.contracts import get_tool_registry
 
     registry = get_tool_registry()
 
@@ -188,7 +188,7 @@ def register_agent_comm_tool():
 
 def unregister_agent_comm_tool():
     """Unregister the send_agent_message tool."""
-    from app.plugins.builtins.ai_assistant.tool_registry import get_tool_registry
+    from app.plugins.builtins.ai_assistant.contracts import get_tool_registry
 
     registry = get_tool_registry()
     registry.unregister("send_agent_message")