feat: add Jasmin assembly integration for crypto acceleration

- Integrated `zupt_mac_verify_ct` in `zupt_decrypt_buffer()` to replace C XOR loop for HMAC-SHA256
- Integrated `zupt_ct_select_32` in `zupt_mlkem768_decaps()` to replace C `cmov()` for FO transformation
- Added `include/zupt_jasmin.h` with extern declarations and ABI docs
- Added `#ifdef ZUPT_USE_JASMIN` guards with clean C fallbacks in `zupt_crypto.c` and `zupt_mlkem.c`
- Makefile now auto-detects `jasmin/*.s`, assembles and links with `-DZUPT_USE_JASMIN`

Closes #3

build.bat

@@ -0,0 +1,21 @@
+@echo off
+echo Zupt v0.4 Build Script for Windows
+where gcc >nul 2>nul
+if %ERRORLEVEL% EQU 0 (
+    gcc -Wall -Wextra -O2 -std=c11 -Iinclude ^
+        src\zupt_main.c src\zupt_format.c src\zupt_lz.c src\zupt_lzh.c src\zupt_xxh.c ^
+        src\zupt_sha256.c src\zupt_aes256.c src\zupt_crypto.c src\zupt_predict.c ^
+        -lm -o zupt.exe
+    if %ERRORLEVEL% EQU 0 (echo [OK] zupt.exe) else (echo [FAIL])
+    exit /b %ERRORLEVEL%
+)
+where cl >nul 2>nul
+if %ERRORLEVEL% EQU 0 (
+    cl /nologo /W4 /O2 /Iinclude /D_CRT_SECURE_NO_WARNINGS ^
+       src\zupt_main.c src\zupt_format.c src\zupt_lz.c src\zupt_lzh.c src\zupt_xxh.c ^
+       src\zupt_sha256.c src\zupt_aes256.c src\zupt_crypto.c src\zupt_predict.c ^
+       /Fe:zupt.exe & del *.obj 2>nul
+    exit /b 0
+)
+echo No C compiler found.
+exit /b 1