init: GitHub/Gitea contribution heatmap apps

Co-authored-by: Cursor <cursoragent@cursor.com>

build.bat

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+@echo off
+setlocal EnableExtensions
+cd /d "%~dp0"
+
+echo.
+echo ========================================
+echo   GitHeatMap Build
+echo ========================================
+echo.
+
+where npm >nul 2>&1
+if errorlevel 1 goto :no_npm
+
+where cargo >nul 2>&1
+if errorlevel 1 goto :no_cargo
+
+if exist "%~dp0generate-icons.ps1" goto :gen_icons
+goto :build_gitea
+
+:gen_icons
+echo [1/4] Generating icons...
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0generate-icons.ps1"
+if errorlevel 1 goto :icon_fail
+echo.
+
+:build_gitea
+echo [2/4] Building Gitea HeatMap...
+cd /d "%~dp0gitea"
+if errorlevel 1 goto :dir_fail
+if not exist "node_modules\" goto :gitea_install
+goto :gitea_build
+
+:gitea_install
+echo       npm install...
+call npm install
+if errorlevel 1 goto :gitea_fail
+
+:gitea_build
+call npm run build
+if errorlevel 1 goto :gitea_fail
+echo       gitea OK
+echo.
+
+echo [3/4] Building GitHub HeatMap...
+cd /d "%~dp0github"
+if errorlevel 1 goto :dir_fail
+if not exist "node_modules\" goto :github_install
+goto :github_build
+
+:github_install
+echo       npm install...
+call npm install
+if errorlevel 1 goto :github_fail
+
+:github_build
+call npm run build
+if errorlevel 1 goto :github_fail
+echo       github OK
+echo.
+
+echo [4/4] Done
+echo.
+echo Output: %~dp0target\release\
+echo   gitea-heatmap.exe
+echo   github-heatmap.exe
+echo ========================================
+echo.
+exit /b 0
+
+:no_npm
+echo ERROR: npm not found. Install Node.js first.
+exit /b 1
+
+:no_cargo
+echo ERROR: cargo not found. Install Rust first.
+exit /b 1
+
+:icon_fail
+echo ERROR: icon generation failed.
+exit /b 1
+
+:dir_fail
+echo ERROR: project directory not found.
+exit /b 1
+
+:gitea_fail
+echo ERROR: Gitea build failed.
+exit /b 1
+
+:github_fail
+echo ERROR: GitHub build failed.
+exit /b 1