Audit v3 fixes: all 3 tiers (19 findings)

Tier 1 (compilation + correctness):
- Fix nightly-only is_multiple_of → % 2 != 0 (stable Rust compat)
- Fix parse_sample_rate: check 192 before 96 (was returning wrong rate)
- macOS drive discovery: split unix.rs → linux.rs + macos.rs
- Linux: EACCES returns DevicePermission not DeviceNotFound
- CLI pipe.rs: Ctrl+C signal handler added

Tier 2 (correctness + security):
- MkvStream: reset demuxer after scanning→streaming transition
- Windows SPTI: zero data buffer before ioctl
- AACS cert verification: documented why silently skipped
- KEYDB: HOME + USERPROFILE fallback for Windows
- Library modules: pub(crate) for internal modules
- AACS: explicit re-exports, AES primitives pub(crate)

Tier 3 (performance + polish):
- IsoStream: batch 64-sector reads (was 1 sector at a time)
- DiscStream: buffer swap instead of copy in decrypt_and_buffer
- Vec capacity hints in TS/PS demuxer hot paths
- NetworkStream: TLS warning documented
- Batch rip: per-title progress display
- cargo fmt: 0 violations

319 tests, 0 fmt violations.

src/mux/network.rs

@@ -1,5 +1,8 @@
 //! NetworkStream — BD-TS over TCP with embedded metadata.
 //!
+//! **Security:** Data is transmitted over plain TCP with no encryption.
+//! Use only on trusted networks (LAN). TLS support is planned.
+//!
 //! Write side (sender): connects to a listener, sends FMKV header + BD-TS data.
 //! Read side (receiver): listens for a connection, reads FMKV header + BD-TS data.
 //!