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>

build.bat

@@ -145,7 +145,9 @@ echo !C_GRN![ ok ]!C_RST!  Header   ^→ dist\include\yapf.h
     echo     yapf_load_mt
     echo     yapf_load_memory_mt
     echo     yapf_save
+    echo     yapf_encode
     echo     yapf_free
+    echo     yapf_free_buffer
 ) > dist\_yapf.def
 
 :: ====================================================================