Add configurable speech-to-text support

[RANGROO]

Summary

• add a global speech-to-text connector with Parakeet as the local default
• support Parakeet, Deepgram, OpenAI Whisper, Local Whisper, Gemini, Azure, and Inworld
• add STT settings, microphone testing, and Parakeet-first Quickstart configuration
• migrate existing installations and seed fresh installs without overwriting current settings
• match HerikaServer's grouped provider sidebar, connector editor, save/test controls, modal test flow, and responsive layout
• retain Stobe fonts, colors, wording, provider defaults, and API badge behavior

Validation

• PHP lint passed for all changed PHP files
• fresh PostgreSQL install seeded Parakeet and GLOBAL_STT_CONNECTOR_ID
• live upgrade migration completed successfully
• multipart stt.php request transcribed a WAV through local Parakeet with HTTP 200
• all 44 existing regression scripts exercised against isolated test databases; 43 pass and settings_context_order_regression.php reproduces unchanged on origin/unstable
• live STT page returned HTTP 200
• desktop and 760px responsive layouts rendered without horizontal overflow
• provider switching correctly toggled URL, API badge, and provider settings
• microphone test opened and closed through the embedded modal

Deployment

• deployed locally to /var/www/html/StobeServer
• deployed PHP file passed runtime lint
• background processor and HTTP endpoints remain available

Companion

• Add push-to-talk speech input STOBE#24

Limits

• cloud STT providers were not exercised with live credentials
• post-fix in-game microphone capture requires the companion plugin and one gameplay push-to-talk attempt