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/zig/README.md

@@ -0,0 +1,13 @@
+# YAPF for Zig
+
+Zig imports `yapf.h` directly — no bindings needed:
+
+```zig
+const c = @cImport(@cInclude("yapf.h"));
+const img = c.yapf_load("texture.yapf") orelse return error.CannotLoad;
+defer c.yapf_free(img);
+```
+
+Add `yapf.c` to your build (`exe.addCSourceFile(.{ .file = b.path("yapf.c") })`,
+`exe.linkLibC()`), or run the example:
+`zig run example.zig ../../yapf.c -I../.. -lc -O ReleaseFast`.