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.

installer/windows/jarvis_setup.iss

@@ -0,0 +1,150 @@
+; Jarvis Inno Setup Script
+; Builds a Windows installer from the PyInstaller onedir output.
+;
+; Usage:
+;   iscc installer\windows\jarvis_setup.iss
+;
+; Expects the PyInstaller onedir output at dist\Jarvis\
+
+#define MyAppName "Jarvis"
+#define MyAppExeName "Jarvis.exe"
+#define MyAppPublisher ""
+; Version can be overridden via ISCC command line: /DMyAppVersion=1.2.3
+#ifndef MyAppVersion
+  #define MyAppVersion "0.0.0"
+#endif
+
+; VC++ Redistributable download URL (VS 2015-2022 x64)
+#define VCRedistURL "https://aka.ms/vs/17/release/vc_redist.x64.exe"
+
+[Setup]
+AppId={{B8A3D6F1-7C42-4E5A-9D12-3F8E6A1B5C90}
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+AppPublisher={#MyAppPublisher}
+DefaultDirName={autopf}\{#MyAppName}
+DefaultGroupName={#MyAppName}
+DisableProgramGroupPage=yes
+OutputDir=..\..\dist
+OutputBaseFilename=Jarvis-Setup-x64
+Compression=lzma2
+SolidCompression=yes
+WizardStyle=modern
+ArchitecturesInstallIn64BitMode=x64compatible
+ArchitecturesAllowed=x64compatible
+UninstallDisplayIcon={app}\{#MyAppExeName}
+PrivilegesRequired=admin
+SetupIconFile=..\..\src\desktop_app\desktop_assets\icon_idle.ico
+
+[Languages]
+Name: "english"; MessagesFile: "compiler:Default.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+Name: "cudalibs"; Description: "Download NVIDIA CUDA libraries for GPU-accelerated speech recognition (~1.1 GB download)"; GroupDescription: "GPU Acceleration:"; Check: HasNvidiaGPU; Flags: unchecked
+
+[Files]
+; Bundle the entire PyInstaller onedir output
+Source: "..\..\dist\Jarvis\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+; Bundle the CUDA installer script (PowerShell — no Python needed)
+Source: "install_cuda.ps1"; DestDir: "{app}"; Flags: ignoreversion
+
+[Icons]
+Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
+Name: "{group}\Uninstall {#MyAppName}"; Filename: "{uninstallexe}"
+Name: "{commondesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
+
+[Run]
+; Install VC++ Redistributable silently if missing
+Filename: "{tmp}\vc_redist.x64.exe"; Parameters: "/quiet /norestart"; StatusMsg: "Installing Visual C++ Redistributable..."; Flags: waituntilterminated; Check: VCRedistNeeded
+; Download CUDA libraries if task selected (uses PowerShell to download and extract wheels).
+; -LogPath ensures every run leaves a transcript at {app}\cuda\install.log so a hidden
+; failure here is recoverable from the bug-report flow and the tray "Reinstall GPU libraries" action.
+Filename: "powershell.exe"; Parameters: "-NoProfile -ExecutionPolicy Bypass -File ""{app}\install_cuda.ps1"" -TargetDir ""{app}\cuda"" -LogPath ""{app}\cuda\install.log"""; StatusMsg: "Downloading CUDA libraries for GPU acceleration (this may take several minutes)..."; Flags: waituntilterminated runhidden; Tasks: cudalibs; AfterInstall: VerifyCudaInstall
+; Launch the application after installation
+Filename: "{app}\{#MyAppExeName}"; Description: "Launch {#MyAppName}"; Flags: nowait postinstall skipifsilent
+
+[UninstallDelete]
+Type: filesandordirs; Name: "{app}"
+
+[Code]
+// Check whether the VC++ 2015-2022 runtime is already installed
+function VCRedistNeeded: Boolean;
+var
+  Version: String;
+begin
+  // Check for VC++ 2015-2022 x64 runtime via registry
+  Result := True;
+  if RegQueryStringValue(HKLM, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\x64', 'Version', Version) then
+  begin
+    // Runtime is installed
+    Result := False;
+  end;
+end;
+
+// Check whether an NVIDIA GPU is present by looking for the CUDA driver DLL
+function HasNvidiaGPU: Boolean;
+var
+  NvSmiPath: String;
+begin
+  // nvcuda.dll is the CUDA driver — present on any system with NVIDIA drivers
+  NvSmiPath := ExpandConstant('{sys}\nvcuda.dll');
+  Result := FileExists(NvSmiPath);
+end;
+
+// Surface CUDA install failures to the user instead of silently letting the
+// installer report success. install_cuda.ps1 only writes its marker after
+// verifying every expected DLL is on disk, so a missing marker means the
+// install really did fail and the user needs to know they can recover via
+// the tray menu's "Reinstall GPU libraries" action.
+procedure VerifyCudaInstall;
+var
+  MarkerPath, LogPath: String;
+begin
+  MarkerPath := ExpandConstant('{app}\cuda\.cuda_installed');
+  LogPath := ExpandConstant('{app}\cuda\install.log');
+  if not FileExists(MarkerPath) then
+  begin
+    Log('CUDA install marker not found at ' + MarkerPath + '; install failed.');
+    MsgBox(
+      'GPU library download did not complete. Jarvis will run on CPU.' #13#10 #13#10 +
+      'You can retry later from the tray menu via "Reinstall GPU libraries".' #13#10 #13#10 +
+      'Details: ' + LogPath,
+      mbInformation, MB_OK);
+  end;
+end;
+
+// Download VC++ Redistributable if needed
+procedure CurStepChanged(CurStep: TSetupStep);
+begin
+  if CurStep = ssInstall then
+  begin
+    if VCRedistNeeded then
+    begin
+      // Download vc_redist.x64.exe from Microsoft
+      DownloadTemporaryFile('{#VCRedistURL}', 'vc_redist.x64.exe', '', nil);
+    end;
+  end;
+end;
+
+// After installation, clean up the old exe if the installer was launched
+// from a legacy location (e.g. old updater placed it at a custom path).
+// The installer can't delete itself while running, so we schedule a
+// cmd /c del command that retries until the file is unlocked.
+procedure DeinitializeSetup;
+var
+  InstallerPath, InstalledDir: String;
+  ResultCode: Integer;
+begin
+  InstallerPath := ExpandConstant('{srcexe}');
+  InstalledDir := ExpandConstant('{app}');
+  // Only clean up if the installer is NOT inside the installation directory
+  // (i.e. it was placed somewhere else by the old updater)
+  if Pos(Lowercase(InstalledDir), Lowercase(InstallerPath)) = 0 then
+  begin
+    Log('Scheduling cleanup of old installer at: ' + InstallerPath);
+    Exec('cmd.exe',
+      '/c ping -n 3 127.0.0.1 >nul & del /f "' + InstallerPath + '"',
+      '', SW_HIDE, ewNoWait, ResultCode);
+  end;
+end;