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.

scripts/build_installer.bat

@@ -0,0 +1,99 @@
+@echo off
+REM Build the Windows installer (Jarvis-Setup-x64.exe) for manual testing.
+REM PyInstaller produces dist\Jarvis\, then Inno Setup wraps that into the
+REM installer at dist\Jarvis-Setup-x64.exe. The resulting installer is the
+REM artefact CI ships, so manual runs of it exercise the same code paths
+REM as a real release including install_cuda.ps1 and the VerifyCudaInstall hook.
+
+REM Navigate to project root (use for-loop to resolve .. reliably across shells)
+for %%I in ("%~dp0..") do set "PROJECT_ROOT=%%~fI"
+cd /d "%PROJECT_ROOT%"
+
+REM Resolve mamba env: prefer this checkout's own, fall back to the main
+REM repo's when running from a git worktree (worktrees share one env).
+set "MAMBA_ENV=%PROJECT_ROOT%\.mamba_env"
+if not exist "%MAMBA_ENV%\python.exe" call :resolve_mamba_from_worktree
+
+if not exist "%MAMBA_ENV%\python.exe" (
+    echo [build_installer] ERROR: Mamba environment not found.
+    echo                   Looked in: %PROJECT_ROOT%\.mamba_env
+    echo                   And the main repo's .mamba_env ^(if this is a git worktree^).
+    echo                   Run the setup script first.
+    exit /b 1
+)
+
+REM ---- Stamp a dev version file so jarvis.get_version() works in the bundle.
+echo [build_installer] Stamping dev _version.py...
+for /f "delims=" %%i in ('git rev-parse --short=7 HEAD 2^>nul') do set "GIT_SHA=%%i"
+if "%GIT_SHA%"=="" set "GIT_SHA=local"
+set "DEV_VERSION=dev-%GIT_SHA%"
+> "%PROJECT_ROOT%\src\jarvis\_version.py" (
+    echo # Auto-generated by scripts/build_installer.bat
+    echo VERSION = "%DEV_VERSION%"
+    echo RELEASE_CHANNEL = "develop"
+)
+
+REM ---- Generate icons (idempotent; cheap to re-run).
+echo [build_installer] Generating icons...
+"%MAMBA_ENV%\python.exe" src\desktop_app\desktop_assets\generate_icons.py
+if errorlevel 1 (
+    echo [build_installer] ERROR: icon generation failed
+    exit /b 1
+)
+
+REM ---- Clean previous build outputs.
+echo [build_installer] Cleaning previous builds...
+if exist "build" rmdir /s /q build
+if exist "dist"  rmdir /s /q dist
+
+REM ---- PyInstaller produces dist\Jarvis\.
+echo [build_installer] Running PyInstaller...
+"%MAMBA_ENV%\python.exe" -m PyInstaller jarvis_desktop.spec
+if not exist "dist\Jarvis\Jarvis.exe" (
+    echo [build_installer] ERROR: PyInstaller did not produce dist\Jarvis\Jarvis.exe
+    exit /b 1
+)
+
+REM ---- Locate ISCC.exe. Try common install paths first, then PATH.
+set "ISCC="
+if exist "C:\Program Files (x86)\Inno Setup 6\ISCC.exe" set "ISCC=C:\Program Files (x86)\Inno Setup 6\ISCC.exe"
+if not defined ISCC if exist "C:\Program Files\Inno Setup 6\ISCC.exe" set "ISCC=C:\Program Files\Inno Setup 6\ISCC.exe"
+if not defined ISCC for /f "delims=" %%i in ('where iscc 2^>nul') do set "ISCC=%%i"
+
+if not defined ISCC (
+    echo [build_installer] ERROR: ISCC.exe not found.
+    echo                   Install Inno Setup 6 from https://jrsoftware.org/isdl.php
+    echo                   or run: choco install innosetup -y
+    exit /b 1
+)
+
+REM ---- Build the installer. /DMyAppVersion is what the .iss file expects.
+echo [build_installer] Running Inno Setup with version %DEV_VERSION%...
+"%ISCC%" /DMyAppVersion="%DEV_VERSION%" installer\windows\jarvis_setup.iss
+if errorlevel 1 (
+    echo [build_installer] ERROR: Inno Setup failed
+    exit /b 1
+)
+
+if not exist "dist\Jarvis-Setup-x64.exe" (
+    echo [build_installer] ERROR: Installer was not produced at dist\Jarvis-Setup-x64.exe
+    exit /b 1
+)
+
+echo.
+echo [build_installer] SUCCESS
+echo                   Installer:  %PROJECT_ROOT%\dist\Jarvis-Setup-x64.exe
+echo                   Frozen app: %PROJECT_ROOT%\dist\Jarvis\Jarvis.exe
+echo.
+echo [build_installer] To test the CUDA install flow, run the installer with the
+echo                   "Download NVIDIA CUDA libraries" task ticked, then check
+echo                   "%%LOCALAPPDATA%%\Programs\Jarvis\cuda\install.log".
+
+goto :eof
+
+:resolve_mamba_from_worktree
+for /f "usebackq delims=" %%G in (`git -C "%PROJECT_ROOT%" rev-parse --git-common-dir 2^>nul`) do set "GIT_COMMON_DIR=%%G"
+if not defined GIT_COMMON_DIR goto :eof
+for %%I in ("%GIT_COMMON_DIR%\..") do set "MAIN_REPO=%%~fI"
+if exist "%MAIN_REPO%\.mamba_env\python.exe" set "MAMBA_ENV=%MAIN_REPO%\.mamba_env"
+goto :eof