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/python/README.md

@@ -21,3 +21,5 @@ It uses the C library through `ctypes` when it finds one:
 Without the library it falls back to a pure-Python decoder that needs
 `numpy` (decoding only; about 1.4 s for a 4K image).  `yapf.backend()`
 tells you which one is in use.
+
+Example: `YAPF_LIBRARY=../../build/libyapf.so python3 example.py ../../other/YAPF.YAPF`