perf: add release profile to reduce binary size (#328)

* perf: add release profile to reduce binary size

Add workspace-level release profile with size optimizations:
- opt-level = "z" (optimize for size)
- lto = true (cross-crate link-time optimization)
- codegen-units = 1 (better whole-program optimization)
- strip = "debuginfo" (remove debug info, preserve C API symbols)

Reduces .text section by ~32% (1.9 MiB → 1.3 MiB). The .a file
grows due to LTO bitcode embedding, but the final linked binary
(libflutter.so) will be smaller when the engine consumes it.

* chore: add codegen and debuginfo to spell check dictionary

Cargo.toml

@@ -1,3 +1,9 @@
 [workspace]
 members = ["library", "patch"]
 resolver = "2"
+
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+strip = "debuginfo"

cspell.config.yaml

@@ -28,10 +28,12 @@ words:
   - cdylib
   - classpath
   - clippy
+  - codegen
   - comde
   - compatch
   - Condvar
   - datadir
+  - debuginfo
   - declspec
   - Decompressor
   - dllexport