myStrom: add optional authentication token support

[dreadnought]

Add support for optional authentication token for myStrom WiFi Switch devices. The token can be configured on the device to restrict API access. When a token is set on the device, it must be provided via the Token HTTP header in all API requests. Devices without a token configured continue to work as before.

The authentication is described in the Security section of their API documentation:
https://api.mystrom.ch/

[sourcery-ai]

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

• The logic for attaching the Token header is duplicated in both Connection.Request and Connection.Report; consider centralizing this in a small helper (e.g., a method that builds requests with the base URI and optional token) to reduce repetition and keep future changes localized.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The logic for attaching the Token header is duplicated in both Connection.Request and Connection.Report; consider centralizing this in a small helper (e.g., a method that builds requests with the base URI and optional token) to reduce repetition and keep future changes localized.

## Individual Comments

### Comment 1
<location> `templates/definition/charger/mystrom.yaml:17-19` </location>
<code_context>
   type: mystrom
   uri: http://{{ .host }}
+  {{- if .token }}
+  token: {{ .token }}
+  {{- end }}
   {{ include "switchsocket" . }}
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Quote the rendered token value to avoid YAML parsing issues with special characters.

Unquoted tokens containing `:`, `#`, or braces can break YAML parsing. Please quote the interpolation (e.g. `token: "{{ .token }}"` or single quotes) so arbitrary token values are handled safely.

```suggestion
  {{- if .token }}
  token: "{{ .token }}"
  {{- end }}
```
</issue_to_address>

### Comment 2
<location> `templates/definition/meter/mystrom.yaml:19` </location>
<code_context>
   type: mystrom
   uri: http://{{ .host }}
+  {{- if .token }}
+  token: {{ .token }}
+  {{- end }}
   {{ include "switchsocket" . }}
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Similarly, quote the token value here to keep YAML robust for arbitrary token strings.

This also keeps it consistent with the charger template; please use `token: "{{ .token }}"` here.
</issue_to_address>

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[sourcery-ai]

suggestion (bug_risk): Similarly, quote the token value here to keep YAML robust for arbitrary token strings.

This also keeps it consistent with the charger template; please use token: "{{ .token }}" here.

[dreadnought]

Thanks for the feedback. I've applied and tested the suggested changes.