Fronius: add Argeno and Smart Meter IP meter templates (#32329)

templates/definition/meter/fronius-argeno.yaml

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+template: fronius-argeno
+products:
+  - brand: Fronius
+    description:
+      generic: Argeno
+requirements:
+  description:
+    de: |
+      Modbus TCP muss am Wechselrichter aktiviert sein (Konfiguration → Kommunikation → Ethernet → Modbus TCP/UDP). Für den Netzzähler siehe Template „Fronius Smart Meter IP" — der Argeno nutzt den Smart Meter IP als eigenständiges Netzwerkgerät.
+    en: |
+      Modbus TCP must be enabled on the inverter (Configuration → Communication → Ethernet → Modbus TCP/UDP). For the grid meter see the "Fronius Smart Meter IP" template — the Argeno uses the Smart Meter IP as a standalone network device.
+params:
+  - name: usage
+    choice: ["pv"]
+  - name: host
+  - name: port
+    default: 502
+  - name: maxacpower
+render: |
+  type: custom
+  # Fronius Argeno: AC output via SunSpec inverter model 113 (float, primary)
+  # on unit 1; 103 (int+sf) as fallback for potential firmware variants. Unlike GEN24, PV must NOT be
+  # read from model 160 DC channels: the Argeno's modular power stages report
+  # only a fraction of plant output there (verified on-site: 160-based read
+  # showed 6.5 kW while actual AC output was 31.7 kW).
+  power:
+    source: sunspec
+    uri: {{ joinHostPort .host .port }}
+    id: 1
+    value:
+      - 113:W
+      - 103:W
+  energy:
+    source: sunspec
+    uri: {{ joinHostPort .host .port }}
+    id: 1
+    value:
+      - 113:WH
+      - 103:WH
+    scale: 0.001
+  maxacpower: {{ .maxacpower }} # W

templates/definition/meter/fronius-smart-meter-ip.yaml

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+template: fronius-smart-meter-ip
+products:
+  - brand: Fronius
+    description:
+      generic: Smart Meter IP
+requirements:
+  description:
+    de: |
+      Modbus TCP muss in der Weboberfläche des Zählers aktiviert sein (Einstellungen → Datenschnittstellen → Modbus (TCP und RTU)). Der Zähler wird direkt über seine eigene IP-Adresse ausgelesen, nicht über den Wechselrichter.
+    en: |
+      Modbus TCP must be enabled in the meter's web interface (Settings → Data interfaces → Modbus (TCP and RTU)). The meter is read directly via its own IP address, not through the inverter.
+params:
+  - name: usage
+    choice: ["grid"]
+  - name: host
+  - name: port
+    default: 502
+  - name: id
+    default: 1
+    advanced: true
+render: |
+  type: custom
+  # Fronius Smart Meter IP (63A-1, 63A-3, 5kA-3): standalone LAN/WLAN meter.
+  # SunSpec model 213 (float, primary) on unit 1; 203 (int+sf) as fallback
+  # for potential firmware variants.
+  power:
+    source: sunspec
+    uri: {{ joinHostPort .host .port }}
+    id: {{ .id }}
+    value:
+      - 213:W
+      - 203:W
+  energy:
+    source: sunspec
+    uri: {{ joinHostPort .host .port }}
+    id: {{ .id }}
+    value:
+      - 213:TotWhImp
+      - 203:TotWhImp
+    scale: 0.001
+  returnenergy:
+    source: sunspec
+    uri: {{ joinHostPort .host .port }}
+    id: {{ .id }}
+    value:
+      - 213:TotWhExp
+      - 203:TotWhExp
+    scale: 0.001
+  currents:
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:AphA
+        - 203:AphA
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:AphB
+        - 203:AphB
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:AphC
+        - 203:AphC
+  voltages:
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:PhVphA
+        - 203:PhVphA
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:PhVphB
+        - 203:PhVphB
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:PhVphC
+        - 203:PhVphC
+  powers:
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:WphA
+        - 203:WphA
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:WphB
+        - 203:WphB
+    - source: sunspec
+      uri: {{ joinHostPort .host .port }}
+      id: {{ .id }}
+      value:
+        - 213:WphC
+        - 203:WphC