refactor: use HTTP login API instead of incus exec for admin login

Same approach as Frappe Cloud (press) — POST to site's /api/method/login
with credentials, extract sid from response cookies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin_panel/api/sites.py

@@ -1107,54 +1107,39 @@ def deploy_container_full(container_name, image="erp", pool_name="default", volu
 
 @frappe.whitelist()
 def get_login_url(container_name, target_server=None):
-	"""Generate a one-time login URL for a container site (login as Administrator)."""
+	"""Generate a login URL for a container site (login as Administrator).
+
+	Uses direct HTTP POST to the site's /api/method/login endpoint,
+	same approach as Frappe Cloud (press).
+	"""
 	_check_admin_permission()
 
 	if not target_server:
 		frappe.throw("Server name is required")
 
-	# Run Python via bench venv inside the container to create a session
-	# Uses heredoc to avoid escaping issues
-	shell_cmd = """su frappe -c 'cd /home/frappe/frappe-bench && ./env/bin/python << "PYEOF"
-import frappe
-frappe.init(site="frontend")
-frappe.connect()
-sid = frappe.generate_hash()
-frappe.db.sql(
-    "INSERT INTO `tabSessions` (`sid`, `user`, `data`, `lastused`, `status`) "
-    "VALUES (%s, %s, %s, NOW(), %s)",
-    (sid, "Administrator", "{}", "Active")
-)
-frappe.db.commit()
-frappe.destroy()
-print(sid)
-PYEOF
-'"""
-
-	result = _exec_in_container(target_server, container_name, shell_cmd, timeout=30)
-
-	output = result.get("output", "").strip()
-
-	if result.get("return_code") != 0:
-		return {
-			"success": False,
-			"error": output or "Failed to generate login token",
-		}
-
-	# Get the last non-empty line (sid) — skip any Python warnings/output
-	sid = ""
-	for line in reversed(output.split("\n")):
-		line = line.strip()
-		if line and len(line) >= 20 and line.isalnum():
-			sid = line
-			break
-
-	if not sid:
-		return {"success": False, "error": f"Could not parse sid from output: {output[:200]}"}
-
 	host_domain = frappe.conf.get("host_domain", "host.jeyerp.az")
 	site_url = f"http://{container_name}.{host_domain}"
 
+	# POST to site's login API with admin credentials (like Frappe Press)
+	try:
+		response = requests.post(
+			f"{site_url}/api/method/login",
+			data={"usr": "Administrator", "pwd": "admin"},
+			timeout=10,
+		)
+	except requests.exceptions.ConnectionError:
+		return {"success": False, "error": f"Cannot connect to {site_url}"}
+	except requests.exceptions.Timeout:
+		return {"success": False, "error": f"Connection to {site_url} timed out"}
+
+	sid = response.cookies.get("sid")
+
+	if not sid or sid == "Guest":
+		return {
+			"success": False,
+			"error": "Login failed. Check that site is running and admin password is correct.",
+		}
+
 	return {
 		"success": True,
 		"url": site_url,