feat(formats): IPFB archive + IDXD definition readers

Add readers for Project Sylpheed's on-disc data format so the
reimplementation can load exact ship/weapon constants straight from
the game files.

- pak.rs: PakArchive — parse the IPFB `.pak` index + concatenated
  `.pNN` segments, binary-search the TOC by name-hash, and transparently
  inflate the per-entry "Z1" (zlib) container. Adds flate2.
- idxd.rs: IdxdObject — parse the IDXD reflective object serialization.
  The string pool stores properties value-before-key with defaulted
  fields omitted; typed getters (get_f32/get_i64/get_str/get_bool) read
  explicit values reliably, get_raw exposes identifier fields, and
  resolved_fields() enumerates every explicit (key,value). Defaulted
  fields correctly return None rather than a neighbouring key.
- sylpheed-cli: `pak list` (inventory entries + identity) and
  `pak dump <hash>` (full stat sheet for one object).

Verified against the real disc (auto-skipped without it): DeltaSaber
craft (HP=1000, Acceleration=600, velocity curve 100/700/1200, Turn=100,
RadarRange=500000) and the DSaber missile (LoadingCount=144, Interval=3.00,
Mass=0.77). 10 unit + 3 integration tests pass.

Not yet decoded: defaulted fields (many ratios, the *Count family) whose
values come from schema defaults or the hash-keyed binary node region.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/sylpheed-formats/Cargo.toml

@@ -9,6 +9,7 @@ authors.workspace = true
 [dependencies]
 xdvdfs    = { workspace = true }
 binrw     = { workspace = true }
+flate2    = "1"                     # zlib/DEFLATE for IPFB "Z1" entries (miniz_oxide backend, WASM-safe)
 tokio     = { workspace = true }
 futures   = { workspace = true }
 thiserror = { workspace = true }