docs: Add branch structure documentation for v14 workflow

BRANCH-STRUCTURE.md

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+# ⚠️ RR3 APK Repository - Branch Structure
+
+**Date:** February 22, 2026  
+**Active Branch:** v14
+
+---
+
+## 📋 Default Branch
+
+**`v14` is the default and primary development branch**
+
+All work on the RR3 Community Edition APK should be done on the `v14` branch.
+
+---
+
+## 🌿 Branch Overview
+
+### Active Branches
+
+**v14** (DEFAULT) ⭐
+- Primary development branch
+- RR3 version 14.0.1 (EA latest before community)
+- Contains all community modifications:
+  - Killswitch removal
+  - Custom server support
+  - Server browser/selection
+  - Settings menu additions
+  - Server URL input dialog (NEW)
+- **All new features go here**
+
+**main**
+- Legacy/documentation branch
+- Contains initial project documentation
+- Not actively developed
+
+**killswitch-killer**
+- Documentation-focused branch
+- Contains killswitch removal guide
+- Code duplicated to v14
+- Primarily for community reference
+
+**discord-apktool** / **discord-community**
+- Experimental/test branches
+- Not actively maintained
+
+---
+
+## 🔧 Workflow
+
+### Starting New Work
+
+```bash
+# 1. Switch to v14
+cd E:\rr3\rr3-apk
+git checkout v14
+
+# 2. Pull latest changes
+git pull origin v14
+git pull gitea v14
+
+# 3. Verify you're on v14
+git branch
+# Should show: * v14
+
+# 4. Start working...
+```
+
+### Committing Changes
+
+```bash
+# 1. Stage changes
+git add .
+
+# 2. Commit with descriptive message
+git commit -m "feat: Your feature description"
+
+# 3. Push to both remotes (v14 branch)
+git push origin v14
+git push gitea v14
+```
+
+### Checking Current Branch
+
+```bash
+# Quick check
+git branch
+
+# Detailed check with remotes
+git branch -vv
+```
+
+---
+
+## 📊 Branch Comparison
+
+| Branch | Purpose | Status | Use Case |
+|--------|---------|--------|----------|
+| **v14** | Primary development | ✅ Active | All new features |
+| main | Documentation | ⚠️ Legacy | Reference only |
+| killswitch-killer | Killswitch docs | 📚 Reference | Community FAQ |
+| discord-* | Experiments | ⏸️ Paused | Testing only |
+
+---
+
+## 🚀 Recent Commits on v14
+
+```
+51be1177d - feat: Add first-launch server URL input dialog
+b7fb41dd0 - Add CORRECTED custom server configuration guide
+240773d28 - Add SSL certificate validation analysis
+d9eec8c69 - Add technical documentation for Nimble SDK killswitch removal
+43a74d365 - Add comprehensive Getting Started guide
+```
+
+---
+
+## ✅ Current State (v14 Branch)
+
+**Features Implemented:**
+- ✅ Killswitch removal (bypasses EA version check)
+- ✅ Custom server URL support (AndroidManifest.xml)
+- ✅ SSL certificate flexibility (self-signed certs work)
+- ✅ Server browser UI (optional)
+- ✅ Settings menu with server options
+- ✅ **Server URL input dialog (LATEST)** - First-launch configuration
+
+**Next Steps:**
+- Sign and test server URL input feature
+- Test on physical device/emulator
+- Add "Change Server" to settings menu
+- Implement server favorites list
+
+---
+
+## 🔄 Syncing Between Remotes
+
+The v14 branch is synced to both remotes:
+
+**GitHub:** https://github.com/supermegamestre/Project-Real-Resurrection-3  
+**Gitea:** https://gitea.barrer.net/project-real-resurrection-3/rr3-apk
+
+```bash
+# Push to both remotes at once
+git push origin v14 && git push gitea v14
+
+# Pull from both (if needed)
+git pull origin v14
+git pull gitea v14
+```
+
+---
+
+## 💡 Best Practices
+
+1. **Always work on v14** - Never commit directly to main
+2. **Pull before starting** - Get latest changes first
+3. **Test before pushing** - Build APK and verify it compiles
+4. **Push to both remotes** - Keep GitHub and Gitea in sync
+5. **Descriptive commits** - Use conventional commit format
+
+**Conventional Commit Format:**
+```
+feat: Add new feature
+fix: Fix a bug
+docs: Update documentation
+refactor: Refactor code
+test: Add tests
+```
+
+---
+
+## 🎯 Remember
+
+**v14 is your home base. All community work happens here.** 🏠
+
+When in doubt:
+```bash
+git checkout v14
+```
+
+---
+
+**Last Updated:** February 22, 2026  
+**Current HEAD (v14):** 51be1177d