feat: Add Tauri as an Alternative Build Option for Jan

[louis-menlo]

This PR introduces Tauri as an alternative build option to Electron, providing a more lightweight and efficient architecture while maintaining full feature parity.

🏗 Architecture Decision

We add Tauri build option to enhance Jan’s performance and cross-platform compatibility. Unlike Electron, which bundles Chromium, Tauri leverages the system’s native webview, resulting in:
✅ Smaller app size (MBs vs. Electron’s hundreds of MBs)
✅ Lower memory & CPU usage for better efficiency
✅ Tauri has many security features built-in by default
✅ Broader platform support (Windows, macOS, Linux, and mobile)

The app logic remains in the Next.js frontend (this can be changed later on), while native functionalities are handled by Tauri’s Rust backend. Cortex is shipped as a sidecar binary, ensuring seamless integration with both Electron and Tauri builds.

📸 Screenshots

✅ Completed

• Set up the Tauri project
• Implemented native API handlers for app-native communication
• Shipped Cortex as a sidecar binary
• Achieved feature parity:
  • Threads & Chat
  • Model management & Hub
  • Engine management
  • Hardware management
  • App extensions
  • Themes
  • Proxy server
  • App Updater

🚧 In Progress

• Relocate app data folder
• Code signing

🛫 To Run with Tauri

make dev-tauri

🎫 Issues
#4485
#4861
#4860

[github-actions]

Barecheck - Code coverage report

Total: 66.99%

Your code coverage diff: -0.57% ▾

Uncovered files and lines

File	Lines
core/src/browser/core.ts	17-19, 87, 98, 105, 114
core/src/browser/extension.ts	93, 101-102, 113-114, 124, 126-128, 134, 169, 171-175, 177-178
core/src/browser/extensions/engines/OAIEngine.ts	46, 61, 73, 111, 141-143, 174
core/src/node/api/processors/app.ts	70, 77, 85-86, 95-96, 100
core/src/node/api/processors/fs.ts	19, 26-28, 30-31, 34, 38-39, 41-42, 54-56, 59, 61-64, 66, 77-79, 82, 84-87, 89
core/src/node/extension/extension.ts	93, 126-127, 164-168, 171, 179-182, 192-194, 196
core/src/node/helper/config.ts	21-23, 26-27, 30, 32-33, 48, 50-51
web/containers/Layout/BottomPanel/SystemMonitor/index.tsx	55, 94, 102, 108, 115-116, 153, 155, 159
web/containers/ModalTroubleShoot/CortexLogs.tsx	14-16, 18-22, 30, 44, 57, 80
web/containers/ServerLogs/index.tsx	22-29, 31, 33-36, 44-46, 50-51, 54-55, 59, 62, 64, 66-67, 69-70, 72-74, 76-77, 81-83, 85, 88-91, 106, 119, 153
web/extension/ExtensionManager.ts	127-128, 131, 134, 138, 172-173, 175-180, 192
web/hooks/useFactoryReset.ts	33, 43
web/hooks/useLoadTheme.ts	27-30, 32-34, 42-46, 77
web/hooks/useModels.ts	47, 51, 61, 63, 67, 88-89
web/hooks/usePath.ts	14-15, 19, 21, 24-25, 31, 33-36, 41, 43-47
web/hooks/useSendChatMessage.ts	113-114, 116-117, 121-122, 125-126, 134, 136-138, 141-143, 146-147, 149-150, 152, 154-156, 158, 160, 162, 166, 169-170, 176-177, 181, 190, 201, 204, 208, 211, 219, 221, 226, 229, 231, 234, 239, 241-242, 245-249, 252, 254-256, 261-263, 265, 274-275, 297, 300, 303-306, 326-327, 331-333, 335, 357-359, 363, 369, 375-376
web/screens/Settings/Advanced/index.tsx	59, 74-76, 79, 151, 174, 179, 199
web/screens/Settings/Privacy/index.tsx	26, 94-95, 97-98, 100, 128
web/services/extensionService.ts	16-17, 20-23, 25, 27, 31-33
web/utils/messageRequestBuilder.ts	40-41, 49, 59-62, 64, 71, 76-77, 84, 89, 104-105, 110, 126-127, 131-132, 137, 140, 146-150, 152, 154, 156, 164, 167, 171