feat: ConvertGUI v2.0 (Wails + preview/trim + NSIS + Gitea CI)

README.md

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+# ConvertGUI
+
+GUI video converter/trimmer powered by Go, Wails v2 (WebView2), and FFmpeg.
+
+## Features
+- Video preview with HTTP byte-range seeking + automatic MP4 proxy fallback (MKV/AVI/HEVC)
+- Interactive dual-handle timeline trim (`-ss`, `-to`), filmstrip thumbnails, loop-selection preview, `I`/`O` hotkeys
+- Optional spatial crop overlay (`crop=w:h:x:y`, even-dimension clamped)
+- Multi-audio stream handling (`amix=inputs=N:normalize=0`, single-track selection, or `-an` mute)
+- Speed multiplier (`0.25x`–`8x`) with `setpts` + chained `atempo`
+- Codecs: `libx264`, `h264_nvenc`, `libx265`, `hevc_nvenc`; HW decode (`none`, `nvdec`, `d3d11va`, `auto`); CRF/CQ, preset, tune, FPS
+- Windows Explorer context menu (`-i "%1"`), drag-and-drop, NSIS installer
+
+## Dev / Build
+```powershell
+cd frontend && npm install && npm run build
+cd .. && go test ./...
+$env:CGO_ENABLED="0"; $env:GOOS="windows"; $env:GOARCH="amd64"
+go build -tags desktop,production -ldflags="-H windowsgui -s -w" -o dist/convert.exe .
+```
+
+## CI
+- Workflow: `.gitea/workflows/build.yaml` (`ubuntu-latest`)
+- Builds `ConvertGUI-Setup-<version>.exe` (NSIS + bundled static `ffmpeg.exe`/`ffprobe.exe`) and `ConvertGUI-Portable-<version>-win64.zip`
+- Publishes release assets on `v*` tags via `akkuman/gitea-release-action@v1`