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/dkm/boot_modules.c

@@ -390,7 +390,9 @@ int dkm_load_elf_rel(const void *address, u64 size, const struct dkm_symbol_scan
     handle.load_stage = desc->stage;
     handle.flags = desc->flags;
 
+    dkm_log_set_driver(desc->name);           /* D4: 驱动自己的颜色 */
     int result = init(dkm_get_kernel_api(), &handle);
+    dkm_log_set_driver(0);
     handle.init_status = result;
     if (result != 0) {
         handle.state = DKM_STATE_FAILED;