fix(input): match original low-byte key scans

The Win16 handlers mask the keyboard scan to its low byte. Main and keypad
Enter therefore both produce the right-flipper scan 0x1c, both Ctrl keys
produce the left-flipper scan 0x1d, and scan 0x1b is the physical
main-keyboard plus/right-bracket position accepted alongside keypad plus. Rust
omitted main Enter and scan 0x1b, and incorrectly assigned Right Ctrl to the
right flipper.

Map the native keys to those recovered scan semantics. Keep A/D, arrows, and
Equal only as explicit modern aliases and document the distinction.

Test Plan:
- `cargo test --workspace --all-targets --all-features` -- 125 passed
- `cargo clippy --workspace --all-targets --all-features -- -D warnings` -- passed
- `rumdl check --flavor commonmark README.md RECONSTRUCTION.md CHANGELOG.md` -- passed
- `git diff --cached --check` -- passed

tdkpin-rs/CHANGELOG.md

@@ -175,6 +175,9 @@ and this project adheres to
   and a player's final ball now clear the key latch, release a raised flipper
   through its normal WAVE 2021 timer edge, and require physical key-up before
   the same key can raise it again.
+- Match the original low-byte keyboard scans: both Ctrl keys operate the left
+  flipper, both Enter keys operate the right, and the physical `0x1b`
+  main-keyboard plus/right-bracket position starts or adds players.
 - Route a single-ball type-3 completion during Tilt through `1000:ae6e` instead
   of granting a free launcher reset: lock holes consume the ball, while record
   148 can still take its required-state special-respawn branch.