Add meter template for V2C Trydan.

[grobihh]

This idea sparked in #28169 (comment)

The tests commenced here #28365 (comment) were run with this Trydan meter template.

[andig]

Nice one, LGTM

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Consider marking the host parameter as required: true to avoid generating a configuration that cannot work without a host being set.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider marking the `host` parameter as `required: true` to avoid generating a configuration that cannot work without a host being set.

## Individual Comments

### Comment 1
<location path="templates/definition/meter/trydan.yaml" line_range="10" />
<code_context>
+  - name: usage
+    choice: ["grid", "pv", "battery"]
+    required: true
+  - name: host
+  - name: port
+    default: 80
</code_context>
<issue_to_address>
**suggestion (bug_risk):** Consider making `host` required or providing a safe default to avoid invalid URIs

Since `host` is interpolated directly into `http://{{ .host }}:{{ .port }}/RealTimeData`, leaving it unset will generate an invalid URL at runtime. Marking it as `required: true` or giving it a sensible default would prevent this silent misconfiguration and make issues easier to detect.

```suggestion
  - name: host
    required: true
```
</issue_to_address>

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[premultiply]

This does not look right

[grobihh]

Grid power = house power - solar power.
I confirmed that with the readings from V2C APP.

[premultiply]

And what about battery?

[grobihh]

Yes, that question occurred to me too.
Unfortunately I do not have a battery and cannot test it.
And I have no documentation about that.
It may be jq: .HousePower - .FVPower - .BatteryPower.