docs: add public roadmap with completed and planned features

Author: Prot10

ROADMAP.md

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+# MyMacCleaner Roadmap
+
+## Completed Features
+
+All critical and most medium-priority features from the competitive analysis have been implemented:
+
+| Feature | Status | Notes |
+|---------|--------|-------|
+| Orphaned Files Scanner | ✅ Done | Scans for leftovers from deleted apps |
+| Duplicate File Finder | ✅ Done | Hash-based detection with cancellation support |
+| Menu Bar Monitor | ✅ Done | Real-time CPU/RAM/Disk with 4 display modes |
+| Browser Privacy Cleaner | ✅ Done | Safari, Chrome, Firefox, Edge, Brave, Arc, Opera |
+| Large & Old Files Filter | ✅ Done | Size filters (>100MB, >500MB, >1GB) and age filters (>30d, >90d, >1y) in Space Lens |
+| Startup Items Manager | ✅ Done | Login items via BTM framework |
+| Homebrew Integration | ✅ Done | List, upgrade, uninstall casks |
+| Sparkle Auto-Updates | ✅ Done | EdDSA-signed updates |
+| Liquid Glass UI | ✅ Done | Native macOS 26 design with fallback |
+| Localization | ✅ Done | EN/IT/ES with runtime switching |
+
+---
+
+## Planned Features
+
+### High Priority
+
+#### Scheduled/Automatic Cleaning
+Background agent for automated maintenance.
+
+**Scope:**
+- Background agent running periodic scans (weekly/monthly)
+- Notification when cleanable space exceeds threshold
+- Optional auto-clean for safe categories (caches, logs)
+- Respect system sleep/low power mode
+
+**Considerations:**
+- Requires Login Item or LaunchAgent
+- User opt-in only
+- Must not impact system performance
+
+---
+
+### Medium Priority
+
+#### File Shredder (Secure Delete)
+Secure deletion with multiple overwrites for sensitive files.
+
+**Scope:**
+- Single-pass zero fill (fast)
+- DoD 5220.22-M standard (3 passes)
+- Gutmann method (35 passes, optional)
+- Integration with existing delete confirmations
+
+**Considerations:**
+- SSD wear concerns (inform user)
+- APFS copy-on-write limitations
+- May require elevated permissions
+
+#### Architecture Stripping (Lipo)
+Remove unused CPU architectures from universal binaries to save space.
+
+**Scope:**
+- Detect universal binaries with unused architectures
+- Strip x86_64 from Apple Silicon Macs (or vice versa)
+- Show potential space savings before action
+- Backup original before modification
+
+**Considerations:**
+- Risk of breaking apps (Rosetta compatibility)
+- Code signature invalidation
+- Should be opt-in with clear warnings
+
+---
+
+### Low Priority / Under Consideration
+
+#### Temperature Monitoring
+Display CPU/GPU temperatures in menu bar.
+
+**Considerations:**
+- Requires SMC access (IOKit)
+- Different sensors per Mac model
+- Stats app already does this well
+
+#### Network Speed Monitor
+Real-time upload/download speed in menu bar.
+
+**Considerations:**
+- Already partially available in menu bar
+- Could expand with per-app bandwidth usage
+
+---
+
+## Not Planned
+
+| Feature | Reason |
+|---------|--------|
+| Malware Scanner | XProtect handles this; would add bloat without real value |
+| VPN/Privacy Tools | Out of scope; many dedicated apps exist |
+| Cloud Storage Cleanup | Too many providers; complex OAuth requirements |
+
+---
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines. Feature requests and pull requests are welcome.
+
+When proposing new features, please consider:
+1. Does it fit the app's focus on system optimization?
+2. Can it be implemented without compromising user privacy?
+3. Does it require elevated permissions? If so, is it justified?