feat: add proper HTTP status codes to all API error responses

- 217 error returns across 18 route files + api.py now use JSONResponse
  with appropriate HTTP status codes instead of returning HTTP 200
- Status code distribution: 500 (121), 400 (39), 503 (28), 404 (24), 409 (3), 502 (2)
- Fixed language.py tuple-return bug (was serializing as JSON array)
- Fixed bare except clauses in bipolar_mode.py and voice.py
- Body-level error schemas preserved (status/error + success/error patterns)
  so web UI continues working without changes
- chat.py (SSE) unchanged: errors sent within stream protocol
- All 170 tests pass

bot/routes/servers.py

@@ -3,6 +3,7 @@
 import os
 import json
 from fastapi import APIRouter
+from fastapi.responses import JSONResponse
 import globals
 from server_manager import server_manager
 from routes.models import ServerConfigRequest
@@ -63,7 +64,7 @@ def add_server(data: ServerConfigRequest):
         server_manager.start_all_schedulers(globals.client)
         return {"status": "ok", "message": f"Server {data.guild_name} added successfully"}
     else:
-        return {"status": "error", "message": "Failed to add server"}
+        return JSONResponse(status_code=500, content={"status": "error", "message": "Failed to add server"})
 
 
 @router.delete("/servers/{guild_id}")
@@ -73,7 +74,7 @@ def remove_server(guild_id: int):
     if success:
         return {"status": "ok", "message": "Server removed successfully"}
     else:
-        return {"status": "error", "message": "Failed to remove server"}
+        return JSONResponse(status_code=404, content={"status": "error", "message": "Failed to remove server"})
 
 
 @router.put("/servers/{guild_id}")
@@ -85,7 +86,7 @@ def update_server(guild_id: int, data: dict):
         server_manager.start_all_schedulers(globals.client)
         return {"status": "ok", "message": "Server configuration updated"}
     else:
-        return {"status": "error", "message": "Failed to update server configuration"}
+        return JSONResponse(status_code=500, content={"status": "error", "message": "Failed to update server configuration"})
 
 
 @router.post("/servers/{guild_id}/bedtime-range")
@@ -96,7 +97,7 @@ def update_server_bedtime_range(guild_id: int, data: dict):
     required_fields = ['bedtime_hour', 'bedtime_minute', 'bedtime_hour_end', 'bedtime_minute_end']
     for field in required_fields:
         if field not in data:
-            return {"status": "error", "message": f"Missing required field: {field}"}
+            return JSONResponse(status_code=400, content={"status": "error", "message": f"Missing required field: {field}"})
 
     try:
         bedtime_hour = int(data['bedtime_hour'])
@@ -105,12 +106,12 @@ def update_server_bedtime_range(guild_id: int, data: dict):
         bedtime_minute_end = int(data['bedtime_minute_end'])
 
         if not (0 <= bedtime_hour <= 23) or not (0 <= bedtime_hour_end <= 23):
-            return {"status": "error", "message": "Hours must be between 0 and 23"}
+            return JSONResponse(status_code=400, content={"status": "error", "message": "Hours must be between 0 and 23"})
         if not (0 <= bedtime_minute <= 59) or not (0 <= bedtime_minute_end <= 59):
-            return {"status": "error", "message": "Minutes must be between 0 and 59"}
+            return JSONResponse(status_code=400, content={"status": "error", "message": "Minutes must be between 0 and 59"})
 
     except (ValueError, TypeError):
-        return {"status": "error", "message": "Invalid time values provided"}
+        return JSONResponse(status_code=400, content={"status": "error", "message": "Invalid time values provided"})
 
     success = server_manager.update_server_config(guild_id, **data)
     if success:
@@ -122,9 +123,9 @@ def update_server_bedtime_range(guild_id: int, data: dict):
                 "message": f"Bedtime range updated: {bedtime_hour:02d}:{bedtime_minute:02d} - {bedtime_hour_end:02d}:{bedtime_minute_end:02d}"
             }
         else:
-            return {"status": "error", "message": "Updated config but failed to update scheduler"}
+            return JSONResponse(status_code=500, content={"status": "error", "message": "Updated config but failed to update scheduler"})
     else:
-        return {"status": "error", "message": "Failed to update bedtime range"}
+        return JSONResponse(status_code=500, content={"status": "error", "message": "Failed to update bedtime range"})
 
 
 @router.post("/servers/repair")
@@ -134,4 +135,4 @@ def repair_server_config():
         server_manager.repair_config()
         return {"status": "ok", "message": "Server configuration repaired and saved"}
     except Exception as e:
-        return {"status": "error", "message": f"Failed to repair configuration: {e}"}
+        return JSONResponse(status_code=500, content={"status": "error", "message": f"Failed to repair configuration: {e}"})