refactor: rename pf-vdisplay-proto -> pf-driver-proto (it spans all drivers)

The shared host<->driver ABI crate already contains more than the virtual
display: the IDD-push frame ring + control plane AND the gamepad shared-memory
layouts (XusbShm / PadShm). "pf-vdisplay-proto" was a misnomer — the name now
represents all the drivers it serves.

Mechanical rename, no behavior change:
- git mv crates/pf-vdisplay-proto -> crates/pf-driver-proto (package name +
  path-deps in the host crate and the driver workspace).
- pf_vdisplay_proto -> pf_driver_proto across host + driver Rust, both Cargo.lock
  files, the workspace members, the CI path triggers (windows-drivers.yml), and
  the docs/INF comments. The runtime Global\pfvd-* shared-object names are a
  SEPARATE contract and are deliberately untouched (host<->driver name matching).
- The pf-vdisplay DRIVER crate + its INF service name (Root\pf_vdisplay,
  UmdfService=pf_vdisplay, pf_vdisplay.dll) are unchanged — only the full
  `pf_vdisplay_proto` token was replaced, never the `pf_vdisplay` driver name.

Linux-verified: cargo test -p pf-driver-proto (const size-asserts compile) +
cargo clippy -p punktfunk-host -D warnings clean; Cargo.lock regenerated. The
driver-workspace side (path-dep + imports + its Cargo.lock) is Windows-CI-gated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/windows/drivers/pf-vdisplay/src/monitor.rs

@@ -2,7 +2,7 @@
 //! ([`crate::control`], `IOCTL_ADD`): each carries the requested mode (advertised as preferred) plus the
 //! `session_id` the host keys it by and the OS target id + render-adapter LUID captured at arrival. Ported
 //! from the working upstream virtual-display-rs (`monitor.rs` + `context.rs::create_monitor`), with
-//! `guid: u128` → `session_id: u64` for the owned `pf_vdisplay_proto` control plane.
+//! `guid: u128` → `session_id: u64` for the owned `pf_driver_proto` control plane.
 
 use std::sync::Mutex;
 use std::time::{Duration, Instant};
@@ -301,7 +301,7 @@ pub fn take_swap_chain_processor(
 }
 
 /// `IOCTL_ADD`: create + arrive a virtual monitor at `width`x`height`@`refresh`. Returns the OS
-/// `(target_id, adapter_luid_low, adapter_luid_high)` for the [`AddReply`](pf_vdisplay_proto::control::AddReply),
+/// `(target_id, adapter_luid_low, adapter_luid_high)` for the [`AddReply`](pf_driver_proto::control::AddReply),
 /// or `None` on failure (no adapter yet / IddCx error).
 pub fn create_monitor(
     session_id: u64,