feat(xoca_dac2121c_energy_meter): add DAC7321C support

Basically seems like a 3-phase variant of the DAC2121C, with some additional
energy tracking dps which may or may not be present in the single phase device.

Also made alarm settings editable with knowledge (text entity)

Issue #6252

custom_components/tuya_local/devices/xoca_dac2121c_energy_meter.yaml

@@ -3,6 +3,9 @@ products:
   - id: opdhepy0p7eyeurz
     manufacturer: Xoca
     model: DAC-2121C BI
+  - id: kvnopv9brskkod3i
+    manufacturer: Xoca
+    model: DAC-7321C BI
 entities:
   - entity: switch
     icon: "mdi:fuse"
@@ -10,15 +13,6 @@ entities:
       - id: 16
         name: switch
         type: boolean
-      - id: 6
-        name: phase_a
-        type: base64
-        optional: true
-        force: true
-      - id: 17
-        name: alarm_set_2
-        type: string
-        optional: true
       - id: 18
         type: string
         name: meter_id
@@ -50,6 +44,38 @@ entities:
   - entity: sensor
     class: voltage
     category: diagnostic
+    deprecated: sensor.voltage_a  # 2026-09-26
+    dps:
+      - id: 6
+        optional: true
+        force: true
+        type: base64
+        unit: V
+        class: measurement
+        name: sensor
+        mask: "FFFF000000000000"
+        mapping:
+          - scale: 10
+  - entity: sensor
+    class: current
+    deprecated: sensor.current_a  # 2026-09-26
+    category: diagnostic
+    dps:
+      - id: 6
+        optional: true
+        force: true
+        type: base64
+        unit: A
+        name: sensor
+        mask: "0000FFFFFF000000"
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: sensor
+    class: voltage
+    translation_key: voltage_x
+    translation_placeholders:
+      x: A
     dps:
       - id: 6
         optional: true
@@ -63,6 +89,9 @@ entities:
           - scale: 10
   - entity: sensor
     class: current
+    translation_key: current_x
+    translation_placeholders:
+      x: A
     dps:
       - id: 6
         optional: true
@@ -76,6 +105,9 @@ entities:
           - scale: 1000
   - entity: sensor
     class: power
+    translation_key: power_x
+    translation_placeholders:
+      x: A
     dps:
       - id: 6
         optional: true
@@ -87,6 +119,179 @@ entities:
         class: measurement
         mapping:
           - scale: 1000
+  - entity: sensor
+    class: voltage
+    translation_key: voltage_x
+    translation_placeholders:
+      x: B
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 7
+        optional: true
+        force: true
+        type: base64
+        unit: V
+        class: measurement
+        name: sensor
+        mask: "FFFF000000000000"
+        mapping:
+          - scale: 10
+  - entity: sensor
+    class: current
+    translation_key: current_x
+    translation_placeholders:
+      x: B
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 7
+        optional: true
+        force: true
+        type: base64
+        unit: A
+        name: sensor
+        mask: "0000FFFFFF000000"
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: sensor
+    class: power
+    translation_key: power_x
+    translation_placeholders:
+      x: B
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 7
+        optional: true
+        force: true
+        type: base64
+        unit: kW
+        name: sensor
+        mask: "0000000000FFFFFF"
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: sensor
+    class: voltage
+    translation_key: voltage_x
+    translation_placeholders:
+      x: C
+    category: diagnostic
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 8
+        optional: true
+        force: true
+        type: base64
+        unit: V
+        class: measurement
+        name: sensor
+        mask: "FFFF000000000000"
+        mapping:
+          - scale: 10
+  - entity: sensor
+    class: current
+    translation_key: current_x
+    translation_placeholders:
+      x: C
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 8
+        optional: true
+        force: true
+        type: base64
+        unit: A
+        name: sensor
+        mask: "0000FFFFFF000000"
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: sensor
+    class: power
+    translation_key: power_x
+    translation_placeholders:
+      x: C
+    hidden: true  # not supported on single phase devices
+    dps:
+      - id: 8
+        optional: true
+        force: true
+        type: base64
+        unit: kW
+        name: sensor
+        mask: "0000000000FFFFFF"
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: sensor
+    class: power
+    category: diagnostic
+    dps:
+      - id: 9
+        optional: true
+        type: integer
+        unit: kW
+        name: sensor
+        class: measurement
+        mapping:
+          - scale: 1000
+  - entity: binary_sensor
+    class: problem
+    category: diagnostic
+    dps:
+      - id: 10
+        type: bitfield
+        optional: true
+        name: sensor
+        mapping:
+          - dps_val: 0
+            value: false
+          - dps_val: null
+            value: false
+          - value: true
+      - id: 10
+        type: bitfield
+        optional: true
+        name: fault_code
+  - entity: text
+    name: Monthly energy
+    category: config
+    icon: "mdi:home-lightning-bolt-outline"
+    hidden: true
+    dps:
+      - id: 3
+        type: base64
+        optional: true
+        name: value
+  - entity: text
+    name: Daily energy
+    category: config
+    icon: "mdi:home-lightning-bolt-outline"
+    hidden: true
+    dps:
+      - id: 4
+        type: base64
+        optional: true
+        name: value
+  - entity: text
+    name: Calendar rollover settings
+    category: config
+    icon: "mdi:cogs"
+    hidden: true
+    dps:
+      - id: 11
+        type: base64
+        optional: true
+        name: value
+  - entity: text
+    name: Alarm settings
+    category: config
+    icon: "mdi:alarm"
+    hidden: true
+    dps:
+      - id: 17
+        type: base64
+        optional: true
+        name: value
   - entity: sensor
     # Night zone
     name: Tariff 1
@@ -141,3 +346,11 @@ entities:
         force: true
         mapping:
           - scale: 100
+  - entity: button
+    name: Clear events
+    category: config
+    dps:
+      - id: 20
+        type: boolean
+        optional: true
+        name: button