Language bindings, KDE thumbnails, yapf compare, in-memory encoding

- yapf_encode() / yapf_free_buffer(): encode to memory; yapf_save uses it
- yapf.c also compiles as C++
- `yapf compare`: size and decode speed of the original format vs YAPF,
  with a lossless check
- bindings with tested examples: C++ (header-only), C# (P/Invoke),
  Rust (crate, builds the C code), Go (cgo), Java (FFM API, Java 22+),
  Zig (@cImport), LuaJIT (FFI), TypeScript types for the JS port;
  Python now encodes in memory
- docs/LANGUAGES.md and examples/ with measured results
- KDE Dolphin thumbnail plugin (KF6, CMake)
- README: honest status for Photoshop / VS Code / Figma (not run in the
  apps yet) and macOS (cross-compiled only), platform table

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bindings/go/example/main.go

@@ -0,0 +1,47 @@
+// go run ./example ../../other/YAPF.YAPF
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"time"
+
+	yapf "github.com/Nexoniarz/YAPF/bindings/go"
+)
+
+func main() {
+	path := "../../other/YAPF.YAPF"
+	if len(os.Args) > 1 {
+		path = os.Args[1]
+	}
+	file, err := os.ReadFile(path)
+	if err != nil {
+		panic(err)
+	}
+	img, err := yapf.Decode(file)
+	if err != nil {
+		panic(err)
+	}
+	best := time.Hour // best of 10, as in a running program
+	for i := 0; i < 10; i++ {
+		t := time.Now()
+		img, _ = yapf.Decode(file)
+		best = min(best, time.Since(t))
+	}
+	fmt.Printf("%s: %dx%d, %d channels, decoded in %.2f ms\n", path, img.Width, img.Height,
+		img.Channels, float64(best.Microseconds())/1000)
+	fmt.Printf("file is %d bytes, %.1f%% of the raw pixels\n", len(file), 100*float64(len(file))/float64(len(img.Pixels)))
+
+	again, _ := yapf.Encode(img)
+	fmt.Printf("re-encoded: %d bytes, identical: %v\n", len(again), bytes.Equal(again, file))
+
+	px := make([]byte, 128*128)
+	for i := range px {
+		px[i] = byte(i % 128 * 2)
+	}
+	if err := yapf.Save("go.yapf", &yapf.Image{Width: 128, Height: 128, Channels: 1, Flags: yapf.FlagSRGB, Pixels: px}); err != nil {
+		panic(err)
+	}
+	fmt.Println("wrote go.yapf")
+}