fix: register alien x llm UCEP provider

[saurabhhhcodes]

Summary

• instantiate the terminal LLMService and register the real alien-x-llm UCEP provider after the libp2p node starts
• add the missing app/llm-extension-provider.js manifest and command handler for chat and ping
• update docs so hosted browser builds are clearly UI-only and validate the terminal provider with window.testExtension('alien-x-llm', 'chat', ['ping'])

Fixes #1

Root Cause

app/index.js logged that alien-x-llm was registered, but it never called registerExtension for that provider. The file-transfer path also referenced llmService without creating it, so terminal-side LLM analysis could crash at runtime.

Testing

• node --check p2p-X/web/app/index.js
• node --check p2p-X/web/app/llm-extension-provider.js
• git diff --check
• npm ci in p2p-X/web/app
• INTERACTIVE=false TIMEOUT_DURATION=5s npm start in p2p-X/web/app
  • confirmed log: Registering extension: alien-x-llm v1.0.0 at /uc/extension/alien-x-llm/1.0.0
  • confirmed log: Extension alien-x-llm registered and will be advertised via Identify

Notes

npm ci reports existing dependency audit findings (3 moderate, 4 high). This PR does not change dependencies.

[Nkovaturient]

isnt this is a duplicate PR of #8 ?

[saurabhhhcodes]

Hi @Nkovaturient, I've rebased this branch onto the latest main, resolved the merge conflict in index.js, and verified that all syntax checks and Node scripts load cleanly. Ready for review and merge. Thanks!

[Nkovaturient]

@saurabhhhcodes : remove the duplicate PR, and present a snapshot of logs and demo the working as mentioned in the Issue. #1

Demo or Repro (show)

Local (expected after fix):

1. cd p2p-X/web/app && npm start — confirm Identify advertises alien-x-llm.
2. cd p2p-X/web && npm run dev — dial /ws multiaddr, mesh sync.
3. Chat message → Alien X reply via UCEP (not browser fetch to Ollama).

Production:

1. Deploy UI to Vercel without VITE_ALLOW_BROWSER_LLM.
2. Run terminal agent with OPENAI_API_KEY or OLLAMA reachable from that host.
3. Connect using production multiaddr (blocked today — see connectivity issue).

Current repro: Browser console shows only echo extension from agent; resolveAlienXReply falls through to UCEP_ONLY_HINT on non-localhost.