chore: gitignore only blocks regenerable binaries - demo video via LFS

- ignore: *.o/*.elf/*.drv/*.img/*.rlib/*.rmeta/*.pdb/*.dbf/*.rgba/target//.build_tmp (all regenerable)

- keep: source assets (png/ttf/webp), vendored payload (SYSTEM/lib dll, SYSTEM/bin exe), demo video (TESTSHOW/*.mp4 via Git LFS), text build logs (.d/.timestamp)

- untrack 290+ build artifacts from index

.gitignore

@@ -1,16 +1,33 @@
-ISO/deshab.img
-ISO/deshab-dev.img
-ISO/deshab-realtest.img
-ISO/deshab-release.img
+# ============================================================
+# Deshab .gitignore — 只防二进制构建产物（可再生成）
+# 源资产（png/ttf/webp）、演示视频（mp4）、文本构建日志（.d/.timestamp）
+# 一律入库。二进制产物由 build.ps1 / mkfont.py / gen_textures.py 再生成。
+# ============================================================
+
+# ---- C 编译产物 ----
 *.o
+*.obj
+*.elf
+*.drv
+
+# ---- 磁盘镜像 / 打包产物 ----
+*.img
+*.iso
+*.vhd
+*.raw
+*.ppm
+
+# ---- Rust 构建产物 ----
+target/
+*.rlib
+*.rmeta
+*.pdb
+
+# ---- 生成资产（源文件在 CODE/desktop/*.png、CODE/font/simhei.ttf、CODE/dsk/logo_data.c） ----
+*.dbf
+*.rgba
+
+# ---- 本地工作区 ----
 .build_tmp/
 .trae/
 docs/workbuddy-planning/
-sata_fat32_dsk.img
-
-
-
-# Large binary images (regenerate from build)
-SYSTEM/boot/linux-rootfs.img
-
-SYSTEM/boot/linux-extra-rootfs.img