fix: keep the workspace green on macOS after the mic/touch/rich-input batch

The new features were Linux-built only and broke the documented macOS gate
(cargo build/test/clippy --workspace) four ways, all fixed following the existing
platform-gating conventions:

- m3.rs: mic_service_thread split into the Linux worker and a non-Linux stub that
  drains and drops (sessions still count the datagrams) — opus/PipeWire are
  Linux-gated deps, same pattern as audio_thread.
- punktfunk-client-rs: the new `opus` dependency moved into the Linux target table and
  --mic-test gated with a warn-and-skip stub (only the synthetic-tone test rig needs
  the encoder; the mic uplink itself is portable).
- gamestream/audio.rs: SAMPLE_RATE import gated to any(linux, test) (the frame_sizing
  test uses it everywhere, the data plane only on Linux).
- tests/c_abi.rs: the harness's macOS link flags gained Security + CoreFoundation —
  the quic feature now pulls rustls's platform verifier into the staticlib.

Also: two clippy match-ref-pats lints in the new rich-input/HID-output decoders
(clippy -D warnings is the repo gate), the regenerated punktfunk_core.h committed (the
checked-in copy predated the rich-input/HID-output constants — CI fails on drift), and
web's inlang cache dir gitignored.

cargo build/test/clippy/fmt --workspace: green on macOS, 122 tests passing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/punktfunk-client-rs/Cargo.toml

@@ -13,6 +13,10 @@ punktfunk-core = { path = "../punktfunk-core", features = ["quic"] }
 quinn = "0.11"
 tokio = { version = "1", features = ["rt-multi-thread", "net", "time", "macros"] }
 anyhow = "1"
-opus = "0.3"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# Linux-only: --mic-test's Opus encoder (libopus). The mic UPLINK itself is portable —
+# only this synthetic-tone test rig needs the encoder.
+[target.'cfg(target_os = "linux")'.dependencies]
+opus = "0.3"