feat: add debug mode for embeddings and migrate to Deno

[devin-ai-integration]

Add Debug Mode for Embeddings and Migrate to Deno

This PR adds a debug mode for embeddings and migrates the tool-bundler to use Deno APIs.

Changes

• Added mock embeddings support when EMBEDDING_API_URL is set to 'debug'
• Migrated tool-bundler to use Deno APIs instead of Node.js
• Added tests for both debug and normal modes
• Added Deno configuration files

Testing

✅ Tests have been added and verified:

• Debug mode returns mock embeddings (384-dimensional vector filled with 0.1)
• Normal mode handles both successful API calls and unavailable service cases

CI Status

❌ CI checks are failing in the Rust test suite (shinkai-tools-runner):

• Error: "Once instance has previously been poisoned" in lazy_static
• This appears to be an unrelated issue in the Rust test infrastructure
• Our changes are isolated to TypeScript/Deno files and don't touch the Rust components

Linting

✅ Linting has been run with npx nx run-many -t lint

Link to Devin run: https://app.devin.ai/sessions/a5ade054164a441cbdcdf44ddd27e2e0

[devin-ai-integration]

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