Add Discord-native hybrid front-end for Jarvis (bot + bridge)

Transform isair/jarvis into a Discord-controlled voice assistant running on
the Ubuntu VNC desktop, keeping the mature ~39k-line Python brain intact.

- bot/ (Node + bun, discord.js): /자비스 slash commands (ephemeral),
  voice channel join + voice receive/playback, pluggable VNC screen broadcast
  (selfbot live / noVNC / screenshot)
- bridge/ (Python, Flask): wraps jarvis STT + run_reply_engine + Piper TTS
  behind a thin localhost HTTP API
- .env.example, scripts/ (start_bridge/start_bot/dev), README rewrite,
  docs/language-comparison.md and docs/vnc-xfce-setup.md

Language decision: hybrid (Python brain + Node/bun Discord layer) because
Discord blocks bot video; native screen broadcast only works via a Node
selfbot library.

examples/config.json

@@ -0,0 +1,99 @@
+{
+  "db_path": "~/.local/share/jarvis/jarvis.db",
+  "sqlite_vss_path": null,
+  "ollama_base_url": "http://127.0.0.1:11434",
+  "ollama_embed_model": "nomic-embed-text",
+  "ollama_chat_model": "gpt-oss:20b",
+  "llm_chat_timeout_sec": 180.0,
+  "llm_tools_timeout_sec": 300.0,
+  "llm_multi_step_timeout_sec": 600.0,
+  "llm_embedding_timeout_sec": 60.0,
+  "llm_profile_select_timeout_sec": 30.0,
+  "active_profiles": [
+    "developer",
+    "business",
+    "life"
+  ],
+  "use_stdin": false,
+  "allowlist_bundles": [
+    "com.apple.Terminal",
+    "com.googlecode.iterm2",
+    "com.microsoft.VSCode",
+    "com.jetbrains.intellij"
+  ],
+  "tts_enabled": true,
+  "tts_engine": "piper",
+  "tts_voice": null,
+  "tts_rate": 200,
+  "tts_piper_model_path": null,
+  "tts_piper_speaker": null,
+  "tts_piper_length_scale": 1.0,
+  "tts_piper_noise_scale": 0.667,
+  "tts_piper_noise_w": 0.8,
+  "tts_piper_sentence_silence": 0.2,
+  "tts_chatterbox_device": "cuda",
+  "tts_chatterbox_audio_prompt": null,
+  "tts_chatterbox_exaggeration": 0.5,
+  "tts_chatterbox_cfg_weight": 0.5,
+  "voice_device": null,
+  "sample_rate": 16000,
+  "voice_min_energy": 0.02,
+  "voice_block_seconds": 4.0,
+  "voice_collect_seconds": 4.5,
+  "voice_max_collect_seconds": 180.0,
+  "wake_word": "jarvis",
+  "wake_aliases": [
+    "joris",
+    "charis",
+    "jar is",
+    "jaivis",
+    "jervis",
+    "jarvus",
+    "jarviz",
+    "javis",
+    "jairus",
+    "jarryst",
+    "chyrus"
+  ],
+  "wake_fuzzy_ratio": 0.78,
+  "whisper_model": "small",
+  "whisper_backend": "auto",
+  "whisper_device": "auto",
+  "whisper_compute_type": "int8",
+  "whisper_vad": true,
+  "whisper_min_confidence": 0.3,
+  "whisper_min_audio_duration": 0.15,
+  "whisper_min_word_length": 1,
+  "vad_enabled": true,
+  "vad_aggressiveness": 2,
+  "vad_frame_ms": 20,
+  "vad_pre_roll_ms": 240,
+  "endpoint_silence_ms": 800,
+  "max_utterance_ms": 12000,
+  "tts_max_utterance_ms": 3000,
+  "tune_enabled": true,
+  "hot_window_enabled": true,
+  "hot_window_seconds": 6.0,
+  "echo_energy_threshold": 2.0,
+  "echo_tolerance": 0.3,
+  "dialogue_memory_timeout": 300.0,
+  "memory_enrichment_max_results": 3,
+  "agentic_max_turns": 8,
+  "stop_commands": [
+    "stop",
+    "quiet",
+    "shush",
+    "silence",
+    "enough",
+    "shut up"
+  ],
+  "stop_command_fuzzy_ratio": 0.8,
+  "location_enabled": true,
+  "location_cache_minutes": 60,
+  "location_ip_address": null,
+  "location_auto_detect": true,
+  "web_search_enabled": true,
+  "brave_search_api_key": "",
+  "wikipedia_fallback_enabled": true,
+  "mcps": {}
+}