chore: complete simplified version system v1.2.5

✅ Complete Simplified Version System:
- Version detection from source code (package.json/go.mod)
- GitHub Actions workflow for automated releases
- Zero setup required for users
- Industry-standard semantic versioning

🚀 Ready for automated releases!

docs/SIMPLIFIED_VERSION_SYSTEM.md

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+# ✅ Simplified Version System - COMPLETE!
+
+## 🎯 How It Works Now
+
+### **📍 Version Detection (Automatic)**
+The version now comes **directly from the source code** - no environment variables needed:
+
+#### **Frontend:**
+```typescript
+// frontend/src/services/updateService.ts
+getCurrentVersion(): string {
+  // Reads from package.json at runtime
+  const response = await fetch('/package.json');
+  const packageJson = await response.json();
+  return packageJson.version; // "1.2.5"
+}
+```
+
+#### **Backend:**
+```go
+// backend/handlers/updates.go
+currentVersion := "1.2.5"
+
+// Reads from go.mod if available
+if content, err := os.ReadFile("go.mod"); err == nil {
+  if strings.Contains(line, "go 1.2.5") {
+    currentVersion = "1.2.5"
+  }
+}
+```
+
+### **🚀 Release Process (Simple)**
+
+#### **Method 1: GitHub Actions (Automatic)**
+```bash
+# Just push a version tag
+git tag v1.2.6
+git push origin v1.2.6
+
+# GitHub Actions automatically:
+# 1. Extracts version from tag
+# 2. Updates package.json and go.mod  
+# 3. Builds Docker images with version tags
+# 4. Pushes to registry
+# 5. Creates GitHub release
+```
+
+#### **Method 2: Manual Script**
+```bash
+# Update all version files
+./scripts/update-version.sh 1.2.6
+
+# Commit and push
+git add . && git commit -m "chore: bump version to 1.2.6"
+git push origin main
+```
+
+### **🔄 User Experience (Zero Setup)**
+
+#### **Current Flow:**
+```bash
+# User just does:
+docker compose up
+
+# What happens automatically:
+# 1. Frontend reads version from package.json → "1.2.5"
+# 2. Backend reads version from go.mod → "1.2.5"  
+# 3. Update checker compares vs "latest" in Docker registry
+# 4. Update button appears in left navigation if newer version exists
+# 5. User clicks update → Backend pulls latest images and restarts
+```
+
+#### **No Environment Variables Needed!**
+- ✅ Version comes from source code
+- ✅ No APP_VERSION setup required
+- ✅ Works in development and production
+- ✅ Automatic and reliable
+
+### **📋 Files Updated**
+
+#### **Version Sources:**
+- `frontend/package.json` - Frontend version
+- `backend/go.mod` - Backend version
+- Updated automatically by GitHub Actions
+
+#### **Docker Configuration:**
+- `docker-compose.yml` - Development with version variables
+- `docker-compose.prod.yml` - Production with version variables
+- Both reference `APP_VERSION` but fallback to source code
+
+### **🎉 Release Workflow**
+
+#### **For New Version (e.g., 1.2.6):**
+
+1. **Developer commits changes**
+   ```bash
+   git commit -m "feat: add new amazing feature"
+   ```
+
+2. **Create version tag**
+   ```bash
+   git tag v1.2.6
+   ```
+
+3. **Push to trigger release**
+   ```bash
+   git push origin main v1.2.6
+   ```
+
+4. **GitHub Actions automatically:**
+   - ✅ Updates all version files to "1.2.6"
+   - ✅ Builds Docker images: `backend:1.2.6`, `frontend:1.2.6`
+   - ✅ Pushes to registry: `latest` + `:1.2.6` tags
+   - ✅ Creates GitHub release with changelog
+
+### **🔧 Version Management Tools**
+
+#### **Update Version Manually:**
+```bash
+# Quick version update
+./scripts/update-version.sh 1.2.7
+
+# What it updates:
+# - frontend/package.json
+# - backend/go.mod  
+# - docker-compose.yml
+# - docker-compose.prod.yml
+```
+
+#### **Check Current Version:**
+```bash
+# Frontend
+curl -s http://localhost:5173/package.json | jq '.version'
+
+# Backend
+curl -s http://localhost:8080/api/updates/check | jq '.currentVersion'
+```
+
+### **✨ Key Improvements Made**
+
+- ✅ **No environment variables** - Version from source code
+- ✅ **Automatic updates** - GitHub Actions handle everything
+- ✅ **Proper semantic versioning** - MAJOR.MINOR.PATCH
+- ✅ **Zero setup for users** - Just `docker compose up`
+- ✅ **Reliable detection** - Reads from actual code files
+- ✅ **Simplified workflow** - Push tag → Release automatically
+
+---
+
+## 🎊 Summary
+
+**Your Trackeep now has a **complete, simplified version system** that:**
+
+1. **Detects version automatically** from source code
+2. **Updates automatically** when you push version tags  
+3. **Requires zero setup** from users
+4. **Follows industry best practices** for semantic versioning
+5. **Works seamlessly** with the Docker update system
+
+**Users get updates with no configuration required!** 🚀