fix(ci): add missing include path for CodeQL C++ build

The CodeQL workflow failed because g++ could not find
compresskit/buffer_api.hpp. Added -I../../shared/cpp/include to all
C++ compilation commands.

Author: LessUp

.github/workflows/codeql.yml

@@ -39,10 +39,10 @@ jobs:
       - name: Build C++ (for C++ analysis)
         if: matrix.language == 'cpp'
         run: |
-          cd algorithms/huffman/cpp && g++ -std=c++17 -O2 main.cpp -o huffman_cpp
-          cd ../../arithmetic/cpp && g++ -std=c++17 -O2 main.cpp -o arithmetic_cpp
-          cd ../../range/cpp && g++ -std=c++17 -O2 main.cpp -o rangecoder_cpp
-          cd ../../rle/cpp && g++ -std=c++17 -O2 main.cpp -o rle_cpp
+          cd algorithms/huffman/cpp && g++ -std=c++17 -O2 -I../../shared/cpp/include main.cpp -o huffman_cpp
+          cd ../../arithmetic/cpp && g++ -std=c++17 -O2 -I../../shared/cpp/include main.cpp -o arithmetic_cpp
+          cd ../../range/cpp && g++ -std=c++17 -O2 -I../../shared/cpp/include main.cpp -o rangecoder_cpp
+          cd ../../rle/cpp && g++ -std=c++17 -O2 -I../../shared/cpp/include main.cpp -o rle_cpp
 
       - name: Setup Rust (for Rust analysis)
         if: matrix.language == 'rust'