voiceapi (#17)

* voiceapi

* opus decoder

write a demo app

* handle connection properly

* tidy

* support google stt

* specify alternative language codes

* support audio file input as a stream

* refactor action detector

* beautify transcript

* make client compatible with beautify

* set markers for beautified segments

* summary generation

* fix action related transcript

* tweak prompt

* fix style

* fix title

* update client code to read envvars

* fix partial transcription is missing

* fix state

* remove unused imports

* update header color

* upload audio to storage

* mcp server

* add talking tab in client app

* adding context manually using mcp

* use gpt-4.1

* add health endpoint

* add prompt

* add command

* include llm api url in env

* vapi metadata

* user id wall

* support userid on client app

* rm unused vars

* fix auth flag operation

* fix client app conversation_id state management

* rm tmp file

Author: leq6c

backend/voiceapi/.env.example

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+# Server Configuration
+PORT=3000
+NODE_ENV=development
+
+# Supabase Configuration
+SUPABASE_URL=your_supabase_url
+SUPABASE_ANON_KEY=your_supabase_anon_key
+SUPABASE_SERVICE_ROLE_KEY=your_supabase_service_role_key
+
+# Speech-to-Text Configuration
+STT_PROVIDER=assemblyai  # Options: 'assemblyai' or 'google-cloud'
+
+# AssemblyAI Configuration
+ASSEMBLYAI_API_KEY=your_assemblyai_api_key
+
+# Google Cloud Speech-to-Text Configuration
+GOOGLE_CLOUD_PROJECT_ID=your_google_cloud_project_id
+GOOGLE_CLOUD_KEY_FILENAME=path/to/your/service-account-key.json
+
+# OpenAI Configuration (for action detection)
+OPENAI_API_KEY=your_openai_api_key
+
+# API Configuration
+OTO_API_KEY_SECRET=your_secret_for_api_key_validation

backend/voiceapi/.gitignore

@@ -0,0 +1,147 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+.env.production
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+public
+
+# Storybook build outputs
+.out
+.storybook-out
+
+# Temporary folders
+tmp/
+temp/
+
+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# Compiled TypeScript files
+dist/
+build/
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Audio files (if storing temporarily)
+*.wav
+*.mp3
+*.m4a
+*.aac
+*.ogg
+*.flac
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3
+
+# Test files
+test-results/
+coverage/
+
+# Documentation build
+docs/build/