feat: D4 DKM colored log prefixes - every driver has its own temper

- log.c: color context (log_set_color / log_color_enable); ANSI only goes to serial, BOOTLOG.TXT buffer stays clean plain text
- kernel_api.c: dkm_log_set_driver() — driver-name FNV-1a hash into an 8-color bright ANSI palette, deterministic per driver
- load sites (dkm_core builtin + boot_modules external) set color around driver_init and clear after
- FUCK [debug] color_log gate (dev=1, release=0)
- QEMU verified: 1150 colored lines, per-driver stable colors (.build_tmp/qemu_serial_d4color.log)

CODE/UTSM/include/utsm/dkm.h

@@ -158,6 +158,8 @@ typedef struct dkm_builtin_driver {
 } dkm_builtin_driver;
 
 void dkm_init(void);
+/* D4: 设置当前驱动日志颜色上下文（driver_init 前设置，返回后清 0） */
+void dkm_log_set_driver(const char *name);
 int dkm_load_builtin(const dkm_builtin_driver *driver);
 void dkm_scan_boot_modules(void);
 void dsm_load_by_manifest(void);

CODE/UTSM/include/utsm/log.h

@@ -13,6 +13,13 @@ void log_error(const char *msg);
 void log_hex64(const char *prefix, u64 value);
 void panic(const char *msg);
 
+/* D4: DKM 彩色日志——驱动 init 期间的颜色上下文。
+ * log_set_color 传 ANSI CSI（如 "\x1b[36m"），0/"" 恢复默认；
+ * 颜色只走串口，BOOTLOG 缓冲保持纯文本。log_color_enable 总开关
+ * （FUCK [debug] color_log）。 */
+void log_set_color(const char *ansi);
+void log_color_enable(int enable);
+
 /* ---- 内存日志缓冲区（实机启动日志持久化） ----
  * 由 disk_log_flush() 写入 FAT32 文件 SYSTEM/DESHAB64/DEV/BOOTLOG.TXT。 */
 void log_capture_enable(int enable);