Add Windows build support and fix Windows compatibility issues- Add build-windows.ps1 PowerShell script for Windows builds- Add BUILD-WINDOWS.md documentation for Windows users - Update build.sh to include Windows AMD64 and .exe extensions- Fix util/util.go Windows path handling (use filepath instead of path)- Fix error logging format (%v instead of %w)- Support Windows AMD64, 386, and ARM64 architectures

BUILD-WINDOWS.md

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+# Building Geek-life for Windows
+
+This document explains how to build and run Geek-life on Windows systems.
+
+## Prerequisites
+
+- Go 1.14 or later installed on your system
+- PowerShell (comes with Windows)
+
+## Building the Application
+
+### Option 1: Using the Windows Build Script (Recommended)
+
+Run the PowerShell build script to build for all Windows architectures:
+
+```powershell
+.\build-windows.ps1
+```
+
+This will create optimized executables for:
+- Windows AMD64 (64-bit) - `geek-life_windows-amd64.exe`
+- Windows 386 (32-bit) - `geek-life_windows-386.exe`  
+- Windows ARM64 - `geek-life_windows-arm64.exe`
+
+### Option 2: Manual Build
+
+For a simple build without optimization:
+```powershell
+go build -o builds/geek-life.exe ./app
+```
+
+For an optimized build (smaller file size):
+```powershell
+$env:GOOS="windows"
+$env:GOARCH="amd64"
+go build -ldflags="-s -w" -o builds/geek-life_windows-amd64.exe ./app
+```
+
+## Running the Application
+
+After building, you can run the application:
+
+```powershell
+# For the optimized AMD64 version (recommended for most users)
+.\builds\geek-life_windows-amd64.exe
+
+# For 32-bit systems
+.\builds\geek-life_windows-386.exe
+
+# For ARM64 systems
+.\builds\geek-life_windows-arm64.exe
+```
+
+## Command Line Options
+
+```powershell
+.\builds\geek-life_windows-amd64.exe --help
+```
+
+Available options:
+- `-d, --db-file string`: Specify DB file path manually
+
+## File Structure
+
+The main entry point is located in `app/cli.go` (not in a traditional `main.go` file at the root).
+
+## Build Optimization
+
+The build script uses the following optimization flags:
+- `-ldflags="-s -w"`: Strips debug information and symbol table to reduce file size
+- Results in approximately 30% smaller executable files
+
+## Troubleshooting
+
+1. **"go: command not found"**: Make sure Go is installed and added to your PATH
+2. **Permission denied**: Run PowerShell as Administrator if needed
+3. **Execution policy**: If you can't run the build script, run: `Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser`
+
+## Cross-compilation from Other Platforms
+
+You can also build Windows executables from Linux/macOS:
+
+```bash
+# From Linux/macOS
+env GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o builds/geek-life_windows-amd64.exe ./app
+env GOOS=windows GOARCH=386 go build -ldflags="-s -w" -o builds/geek-life_windows-386.exe ./app
+```