Templates: add NEcharge charger (OCPP 1.6J)

[Wupsman]

Adds a charger template for the NEcharge Pro. It speaks OCPP 1.6J; the template wraps the generic ocpp charger with branding and setup guidance.

It documents two NEcharge-specific details that are useful for users:

• the charger only accepts current steps of 6/8/10/13/16 A over OCPP (in-between values are rounded down) - no continuous mA control;
• the backend URL has to be set to ws://:8887/ (via the charger's SoftAP setup mode or the app). This is evcc's built-in OCPP central system, which serves plain WebSocket on the local network - not wss.

Tested against a NEcharge Pro (OCPP station id NECH-BE1600057) running against evcc.

[sourcery-ai]

Hey - I've found 2 security issues

Security issues:

• Insecure WebSocket Detected. WebSocket Secure (wss) should be used for all WebSocket connections. (link)
• Insecure WebSocket Detected. WebSocket Secure (wss) should be used for all WebSocket connections. (link)

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="templates/definition/charger/necharge.yaml" line_range="11" />
<code_context>
      NEcharge auf `ws://<evcc-adresse>:8887/` setzen (SoftAP-Konfigmodus bzw. App).
</code_context>
<issue_to_address>
**security (javascript.lang.security.detect-insecure-websocket):** Insecure WebSocket Detected. WebSocket Secure (wss) should be used for all WebSocket connections.

*Source: opengrep*
</issue_to_address>

### Comment 2
<location path="templates/definition/charger/necharge.yaml" line_range="16" />
<code_context>
      `ws://<evcc-host>:8887/` (via the SoftAP setup mode or the app).
</code_context>
<issue_to_address>
**security (javascript.lang.security.detect-insecure-websocket):** Insecure WebSocket Detected. WebSocket Secure (wss) should be used for all WebSocket connections.

*Source: opengrep*
</issue_to_address>

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