Enhance Settings.fds management and installation checks

- Introduced functions to ensure the `IsInstalled` flag is set in `Settings.fds`, preventing the UI from displaying the /Install wizard.
- Added logic to create or patch `Settings.fds` with installation details, including the installation date and version.
- Updated the `install_swarm_comfy.py` script to call the new function, ensuring the installation state is correctly managed during backend operations.
- Added tests to verify the presence of the `IsInstalled` flag in the relevant scripts and ensure proper functionality during installation checks.

src/gpu_rent/remote/install_swarm_comfy.py

@@ -641,6 +641,42 @@ def settings_is_installed() -> bool | None:
     return None
 
 
+def ensure_settings_installed_flag() -> bool:
+    """Write IsInstalled:true if missing — UI otherwise stays on /Install."""
+    SETTINGS.parent.mkdir(parents=True, exist_ok=True)
+    stamp = time.strftime("%Y-%m-%d")
+    if not SETTINGS.is_file():
+        SETTINGS.write_text(
+            "IsInstalled: true\n"
+            f"InstallDate: {stamp}\n"
+            "InstallVersion: gpu-rent\n"
+            "DefaultUser:\n"
+            "    Theme: modern_dark\n",
+            encoding="utf-8",
+        )
+        print("created Settings.fds with IsInstalled=true", flush=True)
+        return True
+    try:
+        text = SETTINGS.read_text(encoding="utf-8", errors="replace")
+    except OSError as exc:
+        print(f"WARN Settings read: {exc}", flush=True)
+        return False
+    if re.search(r"(?im)^\s*IsInstalled:\s*true\s*$", text):
+        return False
+    if re.search(r"(?im)^\s*IsInstalled:\s*", text):
+        text = re.sub(r"(?im)^(\s*IsInstalled:\s*).*$", r"\1true", text, count=1)
+    else:
+        text = (
+            "IsInstalled: true\n"
+            f"InstallDate: {stamp}\n"
+            "InstallVersion: gpu-rent\n"
+            + text
+        )
+    SETTINGS.write_text(text, encoding="utf-8")
+    print("patched Settings.fds IsInstalled=true", flush=True)
+    return True
+
+
 def comfy_venv_ok() -> bool:
     return COMFY_VENV.is_file() and os.access(COMFY_VENV, os.X_OK)
 
@@ -889,17 +925,26 @@ def main() -> int:
             run_diagnostics()
             return 1
         if bstat in ("running", "idle", "loading", "some_loading") and comfy_venv_ok():
+            if ensure_settings_installed_flag():
+                print("IsInstalled was missing — restart swarmui to leave /Install", flush=True)
+                restart_swarmui_local()
             print(f"recovered to {bstat} — skip InstallConfirmWS")
             return 0
 
     # Backends already registered (healthy / loading / suspended) + venv → skip.
     if bstat == "idle":
+        if ensure_settings_installed_flag():
+            print("IsInstalled was missing — restart swarmui to leave /Install", flush=True)
+            restart_swarmui_local()
         print("backends present (idle/suspended) + skip install")
         return 0
     # disabled = empty StartScript / not usable — must recover, not skip.
     need_recover = bstat in ("empty", "disabled", "all_disabled", "unknown")
     if not need_recover and bstat != "errored" and not bstat.startswith("error:"):
         if comfy_venv_ok():
+            if ensure_settings_installed_flag():
+                print("IsInstalled was missing — restart swarmui to leave /Install", flush=True)
+                restart_swarmui_local()
             print(f"backends present ({bstat}) + venv — skip install")
             return 0