Add IOP, audio, pad, fio changes, VAG handling, and call-stack logger (#76)

- Add IOP with RPC handling (handleRPC, LibSd SID) and init/reset using RDRAM
- Add IOP audio layer for LibSd RPC (handleLibSdRpc)
- Add PS2AudioBackend with VAG decode, onVagTransfer/onSoundCommand, raylib playback
- Add PSPadBackend with readState and raylib input
- Add IOP RAM mapping in Memory (getIOPRAM) for EE↔IOP access
- Add fio syscalls: fioOpen, fioRead, fioWrite, fioClose, fioLseek, fioMkdir
- Add VAG accumulation for fio reads (multi-chunk VagAccumEntry)
- Add ps2_log.h call-stack logger (tab-indented, Debug only, ps2_log.txt next to exe)
- Code generator: emit ps2_log include and PS_LOG_ENTRY for full functions
- Recompiler: emit ps2_log include and PS_LOG_ENTRY for stubs
- Runtime: print "[PS2 LOG] Logs saved at <path>" on exit (Debug only)

ps2xRecomp/src/lib/code_generator.cpp

@@ -821,6 +821,9 @@ namespace ps2recomp
             ss << "#include \"ps2_recompiled_stubs.h\"\n\n";
             ss << "#include \"ps2_syscalls.h\"\n";
             ss << "#include \"ps2_stubs.h\"\n\n";
+            ss << "#ifdef _DEBUG\n";
+            ss << "#include \"ps2_log.h\"\n";
+            ss << "#endif\n\n";
         }
 
         AnalysisResult analysisResult = collectInternalBranchTargets(function, instructions);
@@ -836,7 +839,11 @@ namespace ps2recomp
             sanitizedName = nameBuilder.str();
         }
 
-        ss << "void " << sanitizedName << "(uint8_t* rdram, R5900Context* ctx, PS2Runtime *runtime) {\n\n";
+        ss << "void " << sanitizedName << "(uint8_t* rdram, R5900Context* ctx, PS2Runtime *runtime) {\n";
+        ss << "#ifdef _DEBUG\n";
+        ss << "    PS_LOG_ENTRY(\"" << sanitizedName << "\");\n";
+        ss << "#endif\n";
+        ss << "\n";
         ss << "    ctx->pc = 0x" << std::hex << function.start << "u;\n"
            << std::dec;
         ss << "\n";