implement instance editing capability and move user creation to a modal

main.py

@@ -7,6 +7,7 @@ import httpx
 import base64
 import secrets
 import urllib.parse
+from typing import Optional
 from fastapi import FastAPI, Request, Depends, HTTPException
 from fastapi.responses import Response, FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
@@ -328,6 +329,35 @@ def create_instance(inst: InstanceCreate, request: Request):
     conn.close()
     return {"status": "ok"}
 
+@app.put("/api/instances/{id}", dependencies=[Depends(is_authenticated)])
+def update_instance(id: int, inst: InstanceUpdate, request: Request):
+    user_id = request.session.get("user_id")
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    
+    # Verify ownership
+    c.execute('SELECT id FROM instances WHERE id=? AND user_id=?', (id, user_id))
+    if not c.fetchone():
+        conn.close()
+        raise HTTPException(status_code=404, detail="Instance not found")
+    
+    if inst.secret:
+        cleaned = clean_secret(inst.secret)
+        encrypted = fernet.encrypt(cleaned.encode()).decode()
+        c.execute('''
+            UPDATE instances SET name=?, ip=?, port=?, encrypted_secret=?
+            WHERE id=? AND user_id=?
+        ''', (inst.name, inst.ip, inst.port, encrypted, id, user_id))
+    else:
+        c.execute('''
+            UPDATE instances SET name=?, ip=?, port=?
+            WHERE id=? AND user_id=?
+        ''', (inst.name, inst.ip, inst.port, id, user_id))
+        
+    conn.commit()
+    conn.close()
+    return {"status": "ok"}
+
 @app.get("/api/config", dependencies=[Depends(is_authenticated)])
 def get_config():
     return {"firewall_host_ip": FIREWALL_HOST_IP}