chore: Archive all pending OpenSpec proposals

Force archive the following proposals:
- add-audio-device-selector (complete)
- add-embedded-backend-packaging (19/26 tasks)
- add-flexible-deployment-options (20/21 tasks)

New specs created:
- audio-device-management (7 requirements)
- embedded-backend (8 requirements)

Updated specs:
- transcription (+2 requirements for model download progress)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/changes/archive/2025-12-22-add-embedded-backend-packaging/proposal.md

@@ -0,0 +1,28 @@
+# Change: Add Embedded Backend Packaging for All-in-One Deployment
+
+## Why
+Currently, deploying Meeting Assistant requires setting up both the Electron client and a separate backend server. For enterprise internal deployment, users want a simpler experience: **double-click the exe and it works** without needing to understand or configure backend services separately.
+
+Additionally, when users first run the packaged application, the Whisper model download (~1.5GB) shows only "loading_model" status with no progress indication, causing confusion about whether the download is actually happening.
+
+## What Changes
+- **New capability: Embedded Backend** - Package FastAPI backend as a sidecar managed by Electron
+- **Backend sidecar management** - Electron starts/stops backend process automatically
+- **Health check mechanism** - Wait for backend readiness before loading frontend
+- **Configuration unification** - All settings (DB, API keys, auth) in single `config.json`
+- **Backward compatible** - Existing deployment method (separate backend) still works via `backend.embedded: false` flag
+- **Model download progress** - Show real-time download percentage for Whisper model
+
+## Impact
+- Affected specs: `embedded-backend` (new), `transcription` (modified)
+- Affected code:
+  - `backend/run_server.py` (new) - Backend entry point for packaging
+  - `backend/build.py` (new) - PyInstaller build script
+  - `backend/app/config.py` - Support frozen executable paths
+  - `client/src/main.js` - Backend sidecar management
+  - `client/src/preload.js` - Expose backend status API
+  - `client/config.json` - Extended configuration schema
+  - `client/package.json` - Build configuration for backend resources
+  - `sidecar/transcriber.py` - Model download progress reporting
+  - `scripts/build-client.bat` - Integrated build script
+  - `scripts/build-all.ps1` - PowerShell build script