Update version to 3.2.2 in documentation and enhance MIME type support

GIT_RELEASE_NOTES_3.2.2.md

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+## HMAC File Server 3.2.2 - Enhanced MIME Types & XMPP Compatibility
+
+### 🚀 New Features
+- **Enhanced MIME Types**: Added 80+ file format mappings (.flac, .webm, .epub, .docx, .py, .go, etc.)
+- **XMPP Client Ecosystem**: Comprehensive compatibility with Conversations, Dino, Gajim, Monal
+- **Network Resilience**: Optimized mobile WLAN ↔ 5G switching
+
+### 🔧 Improvements
+- Better Content-Type headers for downloads
+- Enhanced browser file handling
+- Future-proof file format support
+- Zero breaking changes
+
+### 📦 Deployment
+```bash
+# Docker
+docker pull hmac-file-server:3.2.2
+
+# Binary
+wget https://github.com/PlusOne/hmac-file-server/releases/download/v3.2.2/hmac-file-server-linux-amd64
+```
+
+### 🛡️ Security
+- HMAC authentication core unchanged
+- 100% backward compatible
+- All XMPP protocols supported
+
+**Drop-in upgrade** - no configuration changes required!