openclaw - 💡(How to fix) Fix [Bug]: NC Talk still non-functional [1 participants]

This blocks all CLI commands (openclaw agent, openclaw doctor --fix, openclaw plugins disable, etc.). The gateway daemon itself starts but NC Talk is non-functional.

### Steps to reproduce

1. Have a working OpenClaw 2026.4.2 installation with nextcloud-talk channel configured
2. npm update -g openclaw (upgrades to 2026.4.5)
3. openclaw doctor --fix — partially migrates config but fails on NC Talk validation
4. Any CLI command fails with plugin load failed: nextcloud-talk: plugin export missing register/activate

### Expected behavior

- Bundled nextcloud-talk plugin should load successfully after upgrade
- Config schema should accept NC Talk configuration keys (baseUrl, botSecret, rooms, etc.)
- openclaw doctor --fix should fully migrate the NC Talk config from 4.2 → 4.5 format
- openclaw channels add --channel nextcloud-talk should work
- 

### Actual behavior

- Plugin fails to load, blocking all CLI commands
- Config schema rejects all configuration keys
- No migration path exists — manual config editing doesn't help because the schema is empty
- channels add reports "does not support add”
- Only workaround is rollback to 2026.4.2

### OpenClaw version

2026.4.4

### Operating system

Ubuntu Linux (24.04)

### Install method

_No response_

### Model

NOT_ENOUGH_INFO

### Provider / routing chain

NOT_ENOUGH_INFO

### Additional provider/model setup details

_No response_

### Logs, screenshots, and evidence

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