AACS pipeline reshape + TrueHD metadata + central consts + clippy/fmt clean

- AACS: delete in-lib keydb parser (Step 3); boil-down primitives
  (mk_from_dk/vuk_from_mk/uk_from_vuk) + newtypes; KeySource->get_uk(ctx)+
  ResolveCtx; Unlocker->unlock()->Result<Vid,UnlockError> + AacsCertUnlocker;
  OEM bus-key gate (AacsBusKeyUnavailable); structured ResolutionTrace (Step 4).
- TrueHD: sample-rate from major-sync, Atmos label, 44.1k AU duration.
- consts: central media/format constants module; 17 duplicate const-defs
  centralized (sector/TS-packet/source-packet); mpls stream-entry + category
  codes named.
- clippy --all-targets -D warnings clean (1.86); fmt clean; 2199 lib tests.

src/mux/mkvstream.rs

@@ -729,8 +729,16 @@ fn parse_track(
     };
     let res = Resolution::from_height(ph);
     let chs = AudioChannels::from_count(ch);
-    let srs = if sr >= 96000.0 {
+    let srs = if sr >= 192000.0 {
+        SampleRate::S192
+    } else if sr >= 176400.0 {
+        SampleRate::S176_4
+    } else if sr >= 96000.0 {
         SampleRate::S96
+    } else if sr >= 88200.0 {
+        SampleRate::S88_2
+    } else if (44100.0..48000.0).contains(&sr) {
+        SampleRate::S44_1
     } else {
         SampleRate::S48
     };