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.

pytest.ini

@@ -0,0 +1,13 @@
+[pytest]
+markers =
+    unit: Fast tests with mocked dependencies - run in CI and git hooks
+    integration: Tests requiring complex setup/external services - run in git hooks only
+    e2e: End-to-end workflow tests with real configurations - run in git hooks only
+    eval: Quality evaluations testing LLM response quality - run manually only
+    performance: Timing harness against a live Ollama - run manually only (needs Ollama reachable)
+
+testpaths = tests
+# Evals are excluded by default, run them explicitly with: pytest evals/ -v
+# Performance tests are excluded by default, run them explicitly with: pytest tests/performance/ -v -m performance
+addopts = -m "not performance"
+