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/routes/layouts.py

@@ -9,6 +9,7 @@ from app import db
 from app.models.layout import Layout
 from app.models.board import Board
 from app.models.sonoff_device import SonoffDevice
+from app.models.tuya_device import TuyaDevice
 
 layouts_bp = Blueprint("layouts", __name__)
 
@@ -53,6 +54,7 @@ def builder(layout_id: int):
     for b in boards:
         bd = {"id": b.id, "name": b.name, "online": b.is_online,
               "relays": [], "inputs": [], "sonoff_channels": [],
+              "tuya_channels": [],
               "board_type": b.board_type}
 
         # ── Standard relay/input boards ──────────────────────────────────────
@@ -104,6 +106,33 @@ def builder(layout_id: int):
                         "isOnline":   dev.is_online,
                     })
 
+        # ── Tuya Cloud sub-devices ────────────────────────────────────────────
+        if b.board_type == "tuya_cloud":
+            TUYA_KIND_ICON = {
+                "switch": "bi-toggles",
+                "light":  "bi-lightbulb-fill",
+                "fan":    "bi-fan",
+                "sensor": "bi-thermometer-half",
+                "cover":  "bi-door-open",
+            }
+            tuya_devs = TuyaDevice.query.filter_by(board_id=b.id).order_by(
+                TuyaDevice.name).all()
+            for dev in tuya_devs:
+                icon = TUYA_KIND_ICON.get(dev.kind, "bi-plug")
+                for dp in dev.switch_dps:
+                    idx   = dev.switch_dps.index(dp)
+                    label = (dev.name if dev.num_channels == 1
+                             else f"{dev.name} – Ch{idx + 1}")
+                    bd["tuya_channels"].append({
+                        "deviceId": dev.device_id,
+                        "channel":  dp,        # dp_code string, e.g. "switch_1"
+                        "name":     label,
+                        "icon":     icon,
+                        "kind":     dev.kind,
+                        "isOn":     dev.status.get(dp, False),
+                        "isOnline": dev.is_online,
+                    })
+
         boards_data.append(bd)
 
     return render_template(