Feature/api versioning system

docs/api/versioning/CHANGELOG.md

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+# API CHANGELOG
+
+Track of all API versions, changes, and migration notes.
+
+## Version History
+
+### [2.0.0] - 2024-12-01
+
+**Status:** Current Stable Release
+
+**Features:**
+- ✨ New account analytics endpoints
+- ✨ Enhanced transaction filtering
+- ✨ Real-time stream improvements
+- ✨ Soroban contract execution API
+- ✨ WebSocket support for live updates
+
+**Breaking Changes:**
+- 🚨 `/accounts/:id` response format changed
+  - Removed: `balance_string`, `balance_num`
+  - Added: `balances` (array)
+  - Migration: See MIGRATION_GUIDE.md
+- 🚨 `/transactions/:id` no longer returns `memo` as separate field
+  - Memo is now nested under `transaction_meta`
+- 🚨 Authentication changed from JWT to OAuth 2.0
+
+**Deprecations:**
+- ⚠️ `/v1/accounts/:id` - sunset 2024-12-31
+- ⚠️ `X-Legacy-Auth` header - sunset 2024-12-31
+
+**Improvements:**
+- 🔧 Performance improvements (30% faster queries)
+- 🔧 Improved error messages
+- 🔧 Better rate limiting headers
+- 🔧 Enhanced logging for debugging
+
+**Migration Effort:** ~2 hours for average integration
+
+---
+
+### [1.2.0] - 2024-06-01
+
+**Status:** Deprecated (Sunset: 2024-12-31)
+
+**Features:**
+- ✨ Added deprecation warnings
+- ✨ New `/analytics/version-usage` endpoint
+- ✨ Improved pagination
+
+**Deprecations:**
+- ⚠️ `/transactions/:id/memo` - removed in v2.0.0
+- ⚠️ `user_address` field - renamed to `publicKey` in v2.0.0
+- ⚠️ `X-Legacy-Auth` header - replaced by OAuth 2.0 in v2.0.0
+
+**Notes:**
+- Backward compatible with 1.0.0 and 1.1.0
+- Recommended upgrade path: 1.2.0 → 2.0.0
+
+**Migration Effort:** ~30 minutes
+
+---
+
+### [1.1.0] - 2024-03-01
+
+**Status:** Unsupported (Sunset: 2024-12-31)
+
+**Features:**
+- ✨ Added `/health` endpoint
+- ✨ Improved error codes
+- ✨ Rate limiting support
+
+**Improvements:**
+- 🔧 Better error responses
+- 🔧 Added `X-RateLimit-*` headers
+
+**Backward Compatibility:** ✅ Compatible with 1.0.0
+
+**Migration Effort:** Minimal
+
+---
+
+### [1.0.0] - 2023-12-01
+
+**Status:** End of Life (Sunset: 2024-12-31)
+
+**Initial Release:**
+- Basic account query endpoints
+- Transaction listing
+- Operation history
+- Simple rate limiting
+
+---
+
+## Upgrade Paths
+
+### 1.0.0 → 1.1.0
+- **Effort:** Minimal
+- **Breaking Changes:** None
+- **Time:** ~15 minutes
+
+### 1.1.0 → 1.2.0
+- **Effort:** Minimal
+- **Breaking Changes:** None
+- **Time:** ~30 minutes
+
+### 1.2.0 → 2.0.0
+- **Effort:** Moderate
+- **Breaking Changes:** Yes (see MIGRATION_GUIDE.md)
+- **Time:** ~2 hours
+- **Tools:** `@stellar-dev-dashboard/migrate-v1-to-v2`
+
+### 1.0.0 → 2.0.0 (Direct)
+- **Effort:** Significant
+- **Breaking Changes:** Yes
+- **Time:** ~4 hours
+- **Recommendation:** Upgrade to 1.2.0 first
+
+---
+
+## Support Timeline
+
+| Version | Released   | Deprecated | Sunset     | Status      |
+|---------|-----------|-----------|-----------|------------|
+| 1.0.0   | 2023-12-01| 2024-03-01| 2024-12-31| End of Life |
+| 1.1.0   | 2024-03-01| 2024-06-01| 2024-12-31| Unsupported |
+| 1.2.0   | 2024-06-01| 2024-12-01| 2024-12-31| Deprecated  |
+| 2.0.0   | 2024-12-01| TBD       | TBD       | Current    |
+
+---
+
+## Breaking Changes by Version
+
+### v1.1.0
+- None (fully backward compatible with v1.0.0)
+
+### v1.2.0
+- None (fully backward compatible with v1.0.0-1.1.0)
+
+### v2.0.0
+- ✅ Response format changes
+- ✅ Field renames
+- ✅ Authentication method
+- ✅ Endpoint path changes
+- ✅ Header changes
+
+See MIGRATION_GUIDE.md for detailed list.
+
+---
+
+## Deprecated Features
+
+### v1.2.0+
+
+| Feature | Deprecated | Sunset | Replacement |
+|---------|-----------|--------|-------------|
+| `/transactions/:id/memo` | 2024-06-01 | 2024-12-31 | `transactions[].meta.memo` |
+| `user_address` field | 2024-06-01 | 2024-12-31 | `publicKey` field |
+| `X-Legacy-Auth` header | 2024-06-01 | 2024-12-31 | OAuth 2.0 |
+| `/v1/accounts/:id` | 2024-06-01 | 2024-12-31 | `/v2/accounts/:id` |
+
+---
+
+## Migration Tools
+
+### Available Tools
+
+```bash
+# Automated migration from v1 to v2
+npm install @stellar-dev-dashboard/migrate-v1-to-v2
+
+# Usage
+migrate-v1-to-v2 --input data.json --output data-v2.json
+```
+
+### Manual Resources
+
+- 📖 [Migration Guide](./MIGRATION_GUIDE.md)
+- 📖 [API Endpoints](./API_ENDPOINTS.md)
+- 📖 [Versioning Guide](./VERSIONING.md)
+
+---
+
+## FAQ
+
+**Q: Which version should I use?**
+A: Always use the latest stable version (2.0.0). It has the best performance and features.
+
+**Q: When does my version sunset?**
+A: Check the Support Timeline table above. All versions sunset on 2024-12-31.
+
+**Q: Can I use multiple versions?**
+A: No, use only one version in production. Use the `X-API-Version` header or URL prefix to specify.
+
+**Q: How do I migrate?**
+A: Follow the step-by-step guide in MIGRATION_GUIDE.md.
+
+**Q: What happens after sunset?**
+A: Old endpoints return 410 Gone with redirect information.
+
+---
+
+## Contact
+
+- **Questions?** support@stellar.dev
+- **Report Issues:** github.com/stellar/dev-dashboard/issues
+- **Migration Help:** migration-team@stellar.dev