fix(rust): Add file playback source files to build-source mode

Problem Analysis:
- Build Source (Dist) mode on macOS/Windows was failing with undefined symbols
- Root cause: ccap_file_reader_apple.mm and ccap_file_reader_windows.cpp were missing
- These files are required when CCAP_ENABLE_FILE_PLAYBACK is enabled (default ON in CMake)
- The FileReaderApple/Windows classes are referenced in ccap_imp_apple.mm and ccap_imp_windows.cpp

Changes:
- Add ccap_file_reader_apple.mm to macOS platform sources
- Add ccap_file_reader_windows.cpp to Windows platform sources
- Define CCAP_ENABLE_FILE_PLAYBACK=1 to enable file playback functionality

Verification:
- Linux build-source mode: ✅ cargo build --no-default-features --features build-source
- Linux tests: ✅ cargo test --no-default-features --features build-source
- All 11 tests passed

This fix ensures build-source mode includes all required source files
for the file playback feature, resolving linker errors on macOS and Windows.

Author: wysaid

bindings/rust/build.rs

@@ -46,7 +46,8 @@ fn main() {
         {
             build
                 .file(ccap_root.join("src/ccap_imp_apple.mm"))
-                .file(ccap_root.join("src/ccap_convert_apple.cpp"));
+                .file(ccap_root.join("src/ccap_convert_apple.cpp"))
+                .file(ccap_root.join("src/ccap_file_reader_apple.mm"));
         }
 
         #[cfg(target_os = "linux")]
@@ -56,7 +57,9 @@ fn main() {
 
         #[cfg(target_os = "windows")]
         {
-            build.file(ccap_root.join("src/ccap_imp_windows.cpp"));
+            build
+                .file(ccap_root.join("src/ccap_imp_windows.cpp"))
+                .file(ccap_root.join("src/ccap_file_reader_windows.cpp"));
         }
 
         // Include directories
@@ -67,6 +70,9 @@ fn main() {
         // Compiler flags
         build.cpp(true).std("c++17"); // Use C++17
 
+        // Enable file playback support
+        build.define("CCAP_ENABLE_FILE_PLAYBACK", "1");
+
         #[cfg(target_os = "macos")]
         {
             build.flag("-fobjc-arc"); // Enable ARC for Objective-C++