fix(robot): repair /api/ai/commands + port back vision-tag stripping

[Love4yzp]

What & why

Triggered while validating robot movement on the deployed Jetson (reachy-claw:slv-v6). Found two real bugs in the REST control path plus device-only work that had never been committed back.

Bug 1 — /api/ai/commands always 503

dashboard_plugin.py looked up get_plugin("ConversationPlugin"), but the plugin registers as "conversation" (strict name match in app.get_plugin). The endpoint never resolved the plugin. One-char fix.

Bug 2 — endpoint 500 on the SLV deployment (only surfaced via on-device test)

This deployment uses the standalone conversation_plugin_slv.ConversationPlugin, which has the _cmd_* handlers but not the _execute_robot_command dispatcher the dashboard calls → AttributeError → 500. Added the dispatcher (exposing the 7 handlers the SLV plugin actually implements). Codex's static review missed this because it only inspected the legacy plugin; it was caught by real-device testing.

Port-back — streaming [Faces: ...] vision-tag stripping

edge_llm.py / llm.py had been hot-patched directly on the device (newer than master) to strip [Faces: ...] vision-context tags from the streamed LLM output so they don't leak into TTS. Never committed → would be lost on image rebuild. Ported back as a unit (the two files are interdependent via _extract_emotion). Adds _StreamingBracketStripper, _VISION_TAG_RE, _RESPONSE_STRIP_RE, and prompt guards.

Validation

• On-device after hot-patching the same changes + restarting reachy-claw:
  • POST /api/ai/commands {command: reachy_status} → {"status":"success","state":"idle","robot_connected":true}
  • POST /api/ai/commands {command: reachy_dance, args:{dance_name:"celebrate"}} → {"status":"success","dance":"celebrate","steps":6} and the robot physically danced.
• New TestStreamingBracketStripper (8 cases: split [emotion]/[Faces:...], unclosed [, trailing-space suppression, non-tag brackets, passthrough) — verified green against the real code inside the container (local Mac env can't resolve deps).

Follow-up (not in this PR)

The Jetson is currently running the hot-patched files (backups at *.bak-apifix). After merge, the reachy-claw:slv-v6 image must be rebuilt and redeployed for the fixes to persist across container recreation.

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