Add instance nav prefs, env config UI, and PM2 restart.

P1-P4: configurable nav/section visibility in system settings, full .env editor with restart badges, password change, runtime hot overrides, and single-instance pm2 restart. Works in hub embed iframe.
Co-authored-by: Cursor <cursoragent@cursor.com>

crypto_monitor_gate/app.py

@@ -1226,6 +1226,11 @@ def init_db():
                  (id INTEGER PRIMARY KEY AUTOINCREMENT, transfer_type TEXT, transfer_day TEXT,
                   amount REAL, from_account TEXT, to_account TEXT, status TEXT, message TEXT,
                   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)''')
+    c.execute(
+        """CREATE TABLE IF NOT EXISTS app_runtime_settings
+           (key TEXT PRIMARY KEY, value TEXT,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"""
+    )
     c.execute('''DROP INDEX IF EXISTS idx_transfer_logs_unique_day''')
     c.execute('''CREATE UNIQUE INDEX IF NOT EXISTS idx_transfer_logs_auto_daily_unique
                  ON transfer_logs(transfer_type, transfer_day)
@@ -7046,6 +7051,7 @@ def render_main_page(page="trade", embed_mode=None):
     conn.close()
     from lib.instance.instance_embed_lib import embed_context_extras
     from lib.instance.instance_settings_lib import settings_page_context
+    from lib.instance.instance_display_prefs_lib import display_prefs_template_context
 
     template_ctx = dict(
         page=page,
@@ -7137,6 +7143,7 @@ def render_main_page(page="trade", embed_mode=None):
             has_active_positions=bool(order_list),
         ),
         **embed_context_extras("gate"),
+        **display_prefs_template_context(get_db),
         **settings_page_context(
             page,
             exchange_key="gate",
@@ -7206,6 +7213,12 @@ def risk_policy_page():
     return render_main_page("risk_policy")
 
 
+@app.route("/env_config")
+@login_required
+def env_config_page():
+    return render_main_page("env_config")
+
+
 @app.route("/settings")
 @login_required
 def settings_page():
@@ -9758,6 +9771,21 @@ try:
 except Exception as _hub_err:
     print(f"[hub_bridge] gate: {_hub_err}")
 
+try:
+    from lib.instance.instance_settings_register import register_instance_settings_routes
+
+    register_instance_settings_routes(
+        app,
+        get_db=get_db,
+        login_required_fn=login_required,
+        base_dir=BASE_DIR,
+        exchange_key="gate",
+        username=USERNAME,
+        password=PASSWORD,
+    )
+except Exception as _settings_err:
+    print(f"[instance_settings] gate: {_settings_err}")
+
 
 @app.route("/strategy")
 @login_required