Add DSMR API v2 support (Ethernet P1 Dongle Pro+)

[hbourmorck]

This PR adds compatibility for DSMR API v2 endpoints used by Smartstuff Ethernet P1 Dongle Pro+ devices.

Documentations

• https://docs.smart-stuff.nl/dsmr-api/geavanceerd/api-overzicht

Suggested change

• Extend the dsmrlogger-aandewiel template to allow selecting the DSMR API version
• Add a new optional configuration parameter: apiversion
• Default to existing behavior (v1) for backward compatibility
• Use the selected version to build endpoint URLs dynamically

[sourcery-ai]

Hey - I've found 2 issues, and left some high level feedback:

• There is a typo in the help text for apiversion ("smarstuff" instead of "Smartstuff") in both the German and English variants; correcting this will avoid confusion in the UI.
• Consider aligning the new product entry with the existing brand/description structure (e.g., brand: Smartstuff and a more specific description.generic) to keep product metadata consistent with the rest of the template.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- There is a typo in the help text for `apiversion` ("smarstuff" instead of "Smartstuff") in both the German and English variants; correcting this will avoid confusion in the UI.
- Consider aligning the new product entry with the existing brand/description structure (e.g., `brand: Smartstuff` and a more specific `description.generic`) to keep product metadata consistent with the rest of the template.

## Individual Comments

### Comment 1
<location path="templates/definition/meter/dsmrlogger-aandewiel.yaml" line_range="24-26" />
<code_context>
+        de: API Version
+        en: API version
+    help:
+        de: "API v1 für DSMR-logger API v1, API v2 für DSMR-logger API v2 (smarstuff P1 Dongle mit DSMR-logger API v2)"
+        en: "Use API v1 for DSMR-logger API v1, use API v2 for DSMR-logger API v2 (smarstuff P1 Dongle with DSMR-logger API v2)"
 render: |
</code_context>
<issue_to_address>
**issue (typo):** Fix the "smarstuff" typo in the German help text.

The product name appears as "Smartstuff" elsewhere, so this should be `Smartstuff P1 Dongle` for consistency in the user-facing text.

```suggestion
    help:
        de: "API v1 für DSMR-logger API v1, API v2 für DSMR-logger API v2 (Smartstuff P1 Dongle mit DSMR-logger API v2)"
        en: "Use API v1 for DSMR-logger API v1, use API v2 for DSMR-logger API v2 (Smartstuff P1 Dongle with DSMR-logger API v2)"
```
</issue_to_address>

### Comment 2
<location path="templates/definition/meter/dsmrlogger-aandewiel.yaml" line_range="26" />
<code_context>
+        en: API version
+    help:
+        de: "API v1 für DSMR-logger API v1, API v2 für DSMR-logger API v2 (smarstuff P1 Dongle mit DSMR-logger API v2)"
+        en: "Use API v1 for DSMR-logger API v1, use API v2 for DSMR-logger API v2 (smarstuff P1 Dongle with DSMR-logger API v2)"
 render: |
   {{- define "uri" -}}
</code_context>
<issue_to_address>
**nitpick (review_instructions):** "smarstuff" is a typo and inconsistent with the "Smartstuff DSMR-logger API" wording used above.

The brand is spelled "Smartstuff" in the `products` section, but in this help text it is spelled "smarstuff". Please correct the spelling to keep wording consistent across this template and with other templates.

<details>
<summary>Review instructions:</summary>

**Path patterns:** `templates/**/*.yaml`

**Instructions:**
Verify that the changes comply to the rules defined in templates/README.md. Also check consistence (wording) with other files inside templates directory.

</details>
</issue_to_address>

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