refactor(host/W4): extract inject keymap tables + rehome HidoutDedup

Two device-agnostic pieces carved out of the inject facade (plan §W4):

- inject/keymap.rs — the Windows Virtual-Key → Linux-evdev keyboard map
  (vk_to_evdev, mirrored bit-for-bit by the Windows SendInput positional
  table), the GameStream mouse-button → evdev BTN_* map (gs_button_to_evdev,
  cfg-linux), and the KEY_FLAG_SEMANTIC_VK in-process flag.
- inject/hidout_dedup.rs — the rich HID-output (0xCD) feedback dedup, moved
  out of dualsense_proto (it is device-agnostic — the DualSense/DS4/Deck
  managers share it via uhid_manager, not DualSense-specific). Its unit test
  moves with it.

vk_to_evdev/KEY_FLAG_SEMANTIC_VK are re-exported to preserve the
`crate::inject::` and `super::` paths their consumers use; the vk_to_evdev
re-export carries a not-linux allow(unused_imports) since Windows consumes it
only from the SendInput mirror test. uhid_manager's import repointed to the
new home.

Pure move; no behavior change. Linux clippy+tests + Windows host clippy
(nvenc,amf-qsv) both green; fmt clean.

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

crates/punktfunk-host/src/inject.rs

@@ -12,15 +12,21 @@
 use anyhow::Result;
 use punktfunk_core::input::{InputEvent, InputKind};
 
-/// In-process tag on a key event's `flags`: the VK in `code` is **layout-semantic** (already
-/// resolved under the sending client's keyboard layout — the GameStream/Moonlight convention)
-/// rather than the punktfunk-native **US-positional** convention (the physical key's US-layout VK,
-/// which every first-party client sends — the client's local layout never touches the wire).
-/// The Windows injector maps semantic VKs through the foreground app's layout and positional VKs
-/// through a fixed table; conflating the two is exactly the German y↔z / ö→ü scramble.
-/// Set ONLY by `gamestream::input::decode`; the punktfunk/1 ingest strips it from wire events, so
-/// a network client can never flip the host's key-decoding convention.
-pub const KEY_FLAG_SEMANTIC_VK: u32 = 0x8000_0000;
+#[path = "inject/keymap.rs"]
+mod keymap;
+#[cfg(target_os = "linux")]
+pub(crate) use keymap::gs_button_to_evdev;
+pub use keymap::KEY_FLAG_SEMANTIC_VK;
+// vk_to_evdev is consumed by the Linux injectors (kwin/libei/wlr) and — on Windows — only by the
+// SendInput mirror test; keep the shared `crate::inject::vk_to_evdev` re-export unconditionally.
+#[cfg_attr(not(target_os = "linux"), allow(unused_imports))]
+pub use keymap::vk_to_evdev;
+
+/// Device-agnostic dedup for the rich HID-output feedback plane (0xCD), shared by the virtual-pad
+/// managers ([`uhid_manager`]).
+#[cfg(any(target_os = "linux", target_os = "windows"))]
+#[path = "inject/hidout_dedup.rs"]
+pub mod hidout_dedup;
 
 /// Injects input events into the host session. Not `Send`: an injector owns compositor
 /// resources (a Wayland connection, an xkb state) and lives entirely on the control thread
@@ -319,154 +325,6 @@ fn libei_ei_source() -> libei::EiSource {
     }
 }
 
-/// Map a Windows Virtual-Key code (as sent by Moonlight/GameStream) to a Linux evdev key code.
-pub fn vk_to_evdev(vk: u8) -> Option<u16> {
-    match vk {
-        // --- Navigation / editing / whitespace ---
-        0x08 => Some(14),  // VK_BACK     -> KEY_BACKSPACE
-        0x09 => Some(15),  // VK_TAB      -> KEY_TAB
-        0x0D => Some(28),  // VK_RETURN   -> KEY_ENTER
-        0x13 => Some(119), // VK_PAUSE    -> KEY_PAUSE
-        0x14 => Some(58),  // VK_CAPITAL  -> KEY_CAPSLOCK
-        0x1B => Some(1),   // VK_ESCAPE   -> KEY_ESC
-        0x20 => Some(57),  // VK_SPACE    -> KEY_SPACE
-        0x21 => Some(104), // VK_PRIOR    -> KEY_PAGEUP
-        0x22 => Some(109), // VK_NEXT     -> KEY_PAGEDOWN
-        0x23 => Some(107), // VK_END      -> KEY_END
-        0x24 => Some(102), // VK_HOME     -> KEY_HOME
-        0x25 => Some(105), // VK_LEFT     -> KEY_LEFT
-        0x26 => Some(103), // VK_UP       -> KEY_UP
-        0x27 => Some(106), // VK_RIGHT    -> KEY_RIGHT
-        0x28 => Some(108), // VK_DOWN     -> KEY_DOWN
-        0x2C => Some(99),  // VK_SNAPSHOT -> KEY_SYSRQ
-        0x2D => Some(110), // VK_INSERT   -> KEY_INSERT
-        0x2E => Some(111), // VK_DELETE   -> KEY_DELETE
-
-        // --- Generic modifiers ---
-        0x10 => Some(42), // VK_SHIFT   -> KEY_LEFTSHIFT
-        0x11 => Some(29), // VK_CONTROL -> KEY_LEFTCTRL
-        0x12 => Some(56), // VK_MENU    -> KEY_LEFTALT
-
-        // --- Digit row (KEY_0 is 11, KEY_1..KEY_9 are 2..10) ---
-        0x30 => Some(11), // VK_0
-        0x31 => Some(2),  // VK_1
-        0x32 => Some(3),  // VK_2
-        0x33 => Some(4),  // VK_3
-        0x34 => Some(5),  // VK_4
-        0x35 => Some(6),  // VK_5
-        0x36 => Some(7),  // VK_6
-        0x37 => Some(8),  // VK_7
-        0x38 => Some(9),  // VK_8
-        0x39 => Some(10), // VK_9
-
-        // --- Letters A-Z (NOT sequential in evdev) ---
-        0x41 => Some(30), // A
-        0x42 => Some(48), // B
-        0x43 => Some(46), // C
-        0x44 => Some(32), // D
-        0x45 => Some(18), // E
-        0x46 => Some(33), // F
-        0x47 => Some(34), // G
-        0x48 => Some(35), // H
-        0x49 => Some(23), // I
-        0x4A => Some(36), // J
-        0x4B => Some(37), // K
-        0x4C => Some(38), // L
-        0x4D => Some(50), // M
-        0x4E => Some(49), // N
-        0x4F => Some(24), // O
-        0x50 => Some(25), // P
-        0x51 => Some(16), // Q
-        0x52 => Some(19), // R
-        0x53 => Some(31), // S
-        0x54 => Some(20), // T
-        0x55 => Some(22), // U
-        0x56 => Some(47), // V
-        0x57 => Some(17), // W
-        0x58 => Some(45), // X
-        0x59 => Some(21), // Y
-        0x5A => Some(44), // Z
-
-        // --- Meta / context-menu ---
-        0x5B => Some(125), // VK_LWIN -> KEY_LEFTMETA
-        0x5C => Some(126), // VK_RWIN -> KEY_RIGHTMETA
-        0x5D => Some(127), // VK_APPS -> KEY_COMPOSE
-
-        // --- Numpad ---
-        0x60 => Some(82), // KP0
-        0x61 => Some(79), // KP1
-        0x62 => Some(80), // KP2
-        0x63 => Some(81), // KP3
-        0x64 => Some(75), // KP4
-        0x65 => Some(76), // KP5
-        0x66 => Some(77), // KP6
-        0x67 => Some(71), // KP7
-        0x68 => Some(72), // KP8
-        0x69 => Some(73), // KP9
-        0x6A => Some(55), // VK_MULTIPLY  -> KEY_KPASTERISK
-        0x6B => Some(78), // VK_ADD       -> KEY_KPPLUS
-        0x6C => Some(96), // VK_SEPARATOR -> KEY_KPENTER
-        0x6D => Some(74), // VK_SUBTRACT  -> KEY_KPMINUS
-        0x6E => Some(83), // VK_DECIMAL   -> KEY_KPDOT
-        0x6F => Some(98), // VK_DIVIDE    -> KEY_KPSLASH
-
-        // --- Function keys (F1..F10 = 59..68, F11/F12 = 87/88) ---
-        0x70 => Some(59),
-        0x71 => Some(60),
-        0x72 => Some(61),
-        0x73 => Some(62),
-        0x74 => Some(63),
-        0x75 => Some(64),
-        0x76 => Some(65),
-        0x77 => Some(66),
-        0x78 => Some(67),
-        0x79 => Some(68),
-        0x7A => Some(87),
-        0x7B => Some(88),
-
-        // --- Locks ---
-        0x90 => Some(69), // VK_NUMLOCK -> KEY_NUMLOCK
-        0x91 => Some(70), // VK_SCROLL  -> KEY_SCROLLLOCK
-
-        // --- Left/right modifiers ---
-        0xA0 => Some(42),  // VK_LSHIFT   -> KEY_LEFTSHIFT
-        0xA1 => Some(54),  // VK_RSHIFT   -> KEY_RIGHTSHIFT
-        0xA2 => Some(29),  // VK_LCONTROL -> KEY_LEFTCTRL
-        0xA3 => Some(97),  // VK_RCONTROL -> KEY_RIGHTCTRL
-        0xA4 => Some(56),  // VK_LMENU    -> KEY_LEFTALT
-        0xA5 => Some(100), // VK_RMENU    -> KEY_RIGHTALT
-
-        // --- OEM punctuation (US layout) ---
-        0xBA => Some(39), // VK_OEM_1      -> KEY_SEMICOLON
-        0xBB => Some(13), // VK_OEM_PLUS   -> KEY_EQUAL
-        0xBC => Some(51), // VK_OEM_COMMA  -> KEY_COMMA
-        0xBD => Some(12), // VK_OEM_MINUS  -> KEY_MINUS
-        0xBE => Some(52), // VK_OEM_PERIOD -> KEY_DOT
-        0xBF => Some(53), // VK_OEM_2      -> KEY_SLASH
-        0xC0 => Some(41), // VK_OEM_3      -> KEY_GRAVE
-        0xDB => Some(26), // VK_OEM_4      -> KEY_LEFTBRACE
-        0xDC => Some(43), // VK_OEM_5      -> KEY_BACKSLASH
-        0xDD => Some(27), // VK_OEM_6      -> KEY_RIGHTBRACE
-        0xDE => Some(40), // VK_OEM_7      -> KEY_APOSTROPHE
-        0xE2 => Some(86), // VK_OEM_102    -> KEY_102ND
-
-        _ => None,
-    }
-}
-
-/// Map a GameStream mouse button id (1=left … 5=X2) to a Linux evdev `BTN_*` code.
-#[cfg(target_os = "linux")]
-fn gs_button_to_evdev(b: u32) -> Option<u32> {
-    Some(match b {
-        1 => 0x110, // BTN_LEFT
-        2 => 0x112, // BTN_MIDDLE
-        3 => 0x111, // BTN_RIGHT
-        4 => 0x113, // BTN_SIDE  (X1)
-        5 => 0x114, // BTN_EXTRA (X2)
-        _ => return None,
-    })
-}
-
 // Goal-1 stage 6: Linux UHID/uinput/libei/wlr backends under `inject/linux/`, the Windows UMDF/SendInput
 // backends under `inject/windows/`, and the transport-independent HID codecs under `inject/proto/`;
 // `#[path]` keeps every `crate::inject::*` module name flat.