docs: comprehensive build system documentation overhaul

- Expand BUILDING.md with detailed platform-specific build commands and workflows
- Add comprehensive web build script documentation with environment modes and Docker support
- Include complete iOS/Android build command reference with auto-run capabilities
- Document Electron build patterns with code signing and packaging instructions
- Add troubleshooting sections for common build issues across platforms
- Streamline README.md by removing redundant build system details
- Include build architecture overview with service worker and environment configuration
- Add comprehensive npm script reference for all build operations
- Document auto-run system and platform-specific testing workflows
- Include security considerations and code signing procedures for distribution

Improves developer experience with complete build system documentation and reduces onboarding friction for new contributors.

README.md

@@ -45,7 +45,7 @@ npm install
 npm run dev
 ```
 
-See [BUILDING.md](BUILDING.md) for more details.
+See [BUILDING.md](BUILDING.md) for comprehensive build instructions for all platforms (Web, Electron, iOS, Android, Docker).
 
 ## Development Database Clearing
 
@@ -107,99 +107,6 @@ rm -rf ~/timesafari-dev-data
 
 See the script for complete platform-specific instructions.
 
-## Build Systems
-
-TimeSafari supports comprehensive build systems for all platforms with unified patterns and consistent tooling.
-
-### **Quick Start Commands**
-
-```bash
-# Web Development (starts dev server)
-npm run build:web:dev
-
-# Android Development (builds debug APK)
-npm run build:android:dev
-
-# iOS Development (builds debug app)
-npm run build:ios:dev
-
-# Electron Development (runs app directly)
-npm run build:electron:dev
-
-# Deploy Android to connected device
-npm run build:android:deploy
-
-# Deploy iOS to connected device
-npm run build:ios:deploy
-```
-
-### **Platform-Specific Builds**
-
-#### **Web Builds**
-- **Development**: Hot reload server at http://localhost:8080
-- **Production**: Optimized static files with PWA support
-- **Docker**: Containerized deployment images
-
-```bash
-npm run build:web:dev      # Development server
-npm run build:web:prod     # Production build
-npm run build:web:docker:prod  # Docker deployment
-```
-
-#### **Android Builds**
-- **Development**: Debug APK with development optimizations
-- **Production**: Release APK/AAB for app store distribution
-- **Deployment**: Direct installation to connected devices
-
-```bash
-npm run build:android:dev      # Development build
-npm run build:android:prod     # Production build
-npm run build:android:deploy   # Build and deploy to device
-```
-
-#### **iOS Builds**
-- **Development**: Debug app with development optimizations
-- **Production**: Release app/IPA for app store distribution
-- **Deployment**: Direct installation to connected devices
-
-```bash
-npm run build:ios:dev          # Development build
-npm run build:ios:prod         # Production build
-npm run build:ios:deploy       # Build and deploy to device
-```
-
-#### **Electron Builds**
-- **Development**: Runs app directly for development
-- **Packages**: Creates distributable executables
-- **Cross-Platform**: Windows, macOS, Linux support
-
-```bash
-npm run build:electron:dev         # Runs app directly
-npm run build:electron:appimage:prod  # Linux AppImage
-npm run build:electron:dmg:prod    # macOS DMG
-npm run build:electron:deb:prod    # Linux DEB
-```
-
-### **Build System Features**
-
-- ✅ **Unified Environment Management**: Consistent dev/test/prod modes
-- ✅ **PWA Support**: Progressive Web App functionality across platforms
-- ✅ **Asset Generation**: Automatic icon and splash screen generation
-- ✅ **Docker Integration**: Containerized deployment options
-- ✅ **Performance Optimization**: Build-time and runtime optimizations
-- ✅ **Error Handling**: Comprehensive error reporting and recovery
-- ✅ **Legacy Compatibility**: Backward-compatible script aliases
-
-### **Comprehensive Documentation**
-
-- **[Build Systems Overview](docs/build-systems-overview.md)** - Complete guide to all build systems
-- **[Web Build Scripts](docs/web-build-scripts.md)** - Web/PWA builds with Docker support
-- **[Android Build Scripts](docs/android-build-scripts.md)** - Mobile builds with device deployment
-- **[iOS Build Scripts](docs/ios-build-scripts.md)** - iOS builds with Xcode integration
-- **[Electron Build Scripts](docs/electron-build-scripts.md)** - Desktop builds with package creation
-- **[Database Clearing](docs/database-clearing.md)** - Development database management
-- **[Build Troubleshooting](docs/build-troubleshooting.md)** - Comprehensive troubleshooting guide
-
 ## Tests
 
 See [TESTING.md](test-playwright/TESTING.md) for detailed test instructions.
@@ -252,7 +159,6 @@ The application uses a platform-agnostic database layer with Vue mixins for serv
 **Development Guidelines**:
 
 - Always use `PlatformServiceMixin` for database operations in components
-- Never import Dexie directly in application code
 - Test with PlatformServiceMixin for new features
 - Use migration tools for data transfer between systems
 - Leverage mixin's ultra-concise methods: `$db()`, `$exec()`, `$one()`, `$contacts()`, `$settings()`