feat: re-instrument per STUB rules - all silent placeholders now panic

- PE-E03 pe_loader.c: unsupported base-reloc type silently skipped -> panic
- PE-E04 pe_shim.c ReadFile: fake TRUE+0-bytes ("pretend EOF") -> panic
- PE-E05 pe_shim.c CreateFileA: no file backend -> panic (no honest-failure excuse)
- PE-E06/E07 x86emu32.c: emu IAT unimplemented API / shim index OOB -> panic
- NETST-E01 net.c: netdev stats all-zero placeholder ("lying zero traffic") -> panic
- apic.c comment: SIPI reserved now points to DKM-E03 skeleton
- pe_dll_manager comments: circular-dep stub call now documented as PE-E01
- virtio_blk.c: capacity declaration marked as instrumentation whitelist
- QEMU verify: wizard -> Save -> verify ok -> login success -> desktop ready,
  zero spurious panics

[STUB] P1/UTSM/pe+net re-instrument sweep | 剩余STUB命中=101 (全部为 panic 坐标注释 /
IDT halt-stub 防御术语 / 白名单) | “未成之物，不留活口”

CODE/DKM/apic/apic.c

@@ -6,7 +6,8 @@
  *   2. IOAPIC 重定向表初始化: 逐条目编程, 将 ISA IRQ 映射到 vector 0x20-0x2F
  *      (兼容 PIC 布局), 逐条目 mask
  *   3. MADT ISO (Interrupt Source Override) 处理: 按 ACPI 规范修正 IRQ→GSI 映射
- *   4. SIPI 多核启动框架 (预留, 未实现)
+ *   4. SIPI 多核启动框架 (预留: 调用 dkm_sipi_wake_ap 即 DKM-E03 panic,
+ *      见 CODE/UTSM/dkm/kernel_api.c 骨架)
  *
  * B7 路由接管 (apic_route):
  *   FUCK [drivers] apic_route=1 时, 本驱动在初始化末尾尝试把中断路由