feat: settings web UI (models / STT / TTS speed / language / LLM instructions)

Adds /settings (served by the bridge) to change the LLM model (from installed
Ollama models), Whisper model, TTS engine + MeloTTS speed, output language,
agentic max-turns, thinking mode, and free-form LLM instructions — live, with a
'apply' that restarts the bridge + TTS worker. Settings persist to the runtime
config JSON; engine reads output_language + llm_instructions and the TTS worker
reads melo_speed from it. Bridge port publishable for access.

bridge/server.py

@@ -52,11 +52,18 @@ from flask import Flask, request, jsonify, Response, stream_with_context
 try:  # package-relative when imported as ``bridge.server``
     from bridge.text_utils import split_sentences
     from bridge.stt_filter import filter_speech_segments, has_speech
+    from bridge import settings_web
 except ImportError:  # script-relative when run as ``bridge/server.py``
     from text_utils import split_sentences
     from stt_filter import filter_speech_segments, has_speech
+    import settings_web
 
 app = Flask(__name__)
+# Settings web UI (/settings) — change models/language/TTS/instructions live.
+try:
+    settings_web.register(app)
+except Exception as _e:  # pragma: no cover - never block the bridge on the UI
+    print(f"[bridge] settings UI unavailable: {_e}", flush=True)
 
 # ---------------------------------------------------------------------------
 # Configuration (env-driven; see .env.example)