Add Tuya Cloud integration; 2-step add-board wizard; DP value formatting

- Tuya Cloud Gateway driver (tuya-device-sharing-sdk):
  - QR-code auth flow: user-provided user_code, terminal_id/endpoint
    returned by Tuya login_result (mirrors HA implementation)
  - Device sync, toggle DP, rename, per-device detail page
  - category → kind mapping; detect_switch_dps helper
  - format_dp_value: temperature (÷10 + °C/°F), humidity (+ %)
    registered as 'tuya_dp' Jinja2 filter

- TuyaDevice model (tuya_devices table)

- Templates:
  - tuya/gateway.html: device grid with live-reading sensor cards
    (config/threshold keys hidden from card, shown on detail page)
  - tuya/device.html: full status table with formatted DP values
  - tuya/auth_settings.html: user_code input + QR scan flow

- Add-board wizard refactored to 2-step flow:
  - Step 1: choose board type (Cloud Gateways vs Hardware)
  - Step 2: type-specific fields; gateways skip IP/relay fields

- Layout builder: Tuya chip support (makeTuyaChip, tuya_update socket)

- requirements.txt: tuya-device-sharing-sdk, cryptography

app/__init__.py

@@ -36,6 +36,7 @@ def create_app(config_name: str = "default") -> Flask:
     from app.routes.api import api_bp
     from app.routes.admin import admin_bp
     from app.routes.sonoff import sonoff_bp
+    from app.routes.tuya import tuya_bp
     from app.routes.layouts import layouts_bp
 
     app.register_blueprint(auth_bp)
@@ -45,6 +46,7 @@ def create_app(config_name: str = "default") -> Flask:
     app.register_blueprint(api_bp, url_prefix="/api")
     app.register_blueprint(admin_bp, url_prefix="/admin")
     app.register_blueprint(sonoff_bp)
+    app.register_blueprint(tuya_bp)
     app.register_blueprint(layouts_bp, url_prefix="/layouts")
 
     # ── user loader ───────────────────────────────────────────────────────────
@@ -59,11 +61,20 @@ def create_app(config_name: str = "default") -> Flask:
     registry.discover()
     app.logger.info("Board drivers loaded: %s", [d.DRIVER_ID for d in registry.all()])
 
+    # ── Jinja filters ─────────────────────────────────────────────────────────
+    from app.drivers.tuya_cloud.driver import format_dp_value as _tuya_fmt
+
+    @app.template_filter("tuya_dp")
+    def _tuya_dp_filter(value, dp_code: str, status=None):
+        """Format a raw Tuya DP value for display (temperature scaling, units…)."""
+        return _tuya_fmt(dp_code, value, status)
+
     # ── create tables & seed admin on first run ───────────────────────────────
     with app.app_context():
         # Import all models so their tables are registered before create_all
         from app.models import board, user, workflow  # noqa: F401
         from app.models import sonoff_device  # noqa: F401
+        from app.models import tuya_device  # noqa: F401
         from app.models import layout  # noqa: F401
         db.create_all()
         _seed_admin(app)