Add v1.1.0 release notes

RELEASE_NOTES_v1.1.0.md

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+# DragonX Android Wallet v1.1.0 Release Notes
+
+---
+
+## ⚠️ IMPORTANT: UPGRADE INSTRUCTIONS ⚠️
+
+### You MUST uninstall the previous version before installing v1.1.0.
+
+### Due to a signing key change, Android will not allow an in-place upgrade. Follow these steps carefully:
+
+### 1. BACK UP YOUR WALLET SEED PHRASE
+- Open the currently installed DragonX wallet
+- Go to **Settings** → **Backup Wallet**
+- Write down or securely copy your **24-word seed phrase**
+- **Triple-check** you have it correct — this is the ONLY way to recover your funds
+
+### 2. UNINSTALL THE OLD VERSION
+- Go to your phone's **Settings** → **Apps** → **DragonX Wallet**
+- Tap **Uninstall**
+
+### 3. INSTALL v1.1.0
+- Install the new APK
+- Choose **Restore Wallet** and enter your 24-word seed phrase
+- The wallet will re-sync from the blockchain and restore your balance
+
+### After this one-time upgrade, all future updates will install normally without uninstalling.
+
+---
+
+## What's New
+
+### Reorg Detection & Repair
+- The wallet now detects blockchain reorganizations and prompts you to repair wallet data automatically, preventing stuck syncs and incorrect balances.
+
+### Server Failover & Live Switching
+- If the connected lite server goes down, the wallet automatically probes all available servers and connects to a reachable one.
+- New **server picker dialog** lets you manually switch servers with online/offline status indicators — no app restart required.
+
+### Faster Block Sync
+- Block download batch size increased 10x (50 → 500), significantly reducing sync time during initial setup and catching up after being offline.
+
+### Unified Signing
+- Debug and release builds now use the same signing key, so future upgrades will always install smoothly over previous versions.
+
+---
+
+## Downloads
+
+| File | SHA-256 |
+|---|---|
+| `SilentDragonXAndroid - v1.1.0.apk` | `3b53e730652870b0f0880f13ec256f0bc379552783579387f58503242d43d1fc` |