feat(irr): add IRR data support with RPSL parsing and AS info enrichment

[digizeph]

Summary

Add IRR (Internet Routing Registry) data support to bgpkit-commons, including a new irr module for parsing RPSL data and extending asinfo with structured IRR and delegated-stats enrichment.

New irr module

Library-level RPSL parsing toolkit using rpsl-rs v3.0:

• 14 known IRR registries (RIPE, APNIC, ARIN, LACNIC, AFRINIC, NTTCOM, RADB, + 7 more) with per-registry dump URLs, transport (HTTPS/FTP), and format (split files vs whole-DB)
• Typed structs for 7 RPSL object types: AutNum, Route, Route6, AsSet, RouteSet, Mntner, Organisation
• Streaming parser via oneio with lossy UTF-8 handling for legacy IRR data
• Single-pass download for whole-DB sources (RADB, ARIN, etc. downloaded once, all object types extracted)

Extended asinfo module

• DelegatedInfo struct: structured RIR delegated-stats data (registry, country, date, status) for every allocated ASN
• IrrAsnInfo struct: per-source IRR data (as-name, descr, mnt-by, route prefixes, route6 prefixes, as-set memberships) stored as a Vec so callers pick which source(s) to trust
• AsInfoProfile enum with three presets:
  • Minimum: asn.txt only (~1s load)
  • Default: + as2org, population, hegemony, peeringdb (~30s) — matches current production
  • Full: + delegated stats + IRR data with route prefixes (~75s)
• AsInfoBuilder for fine-grained control: .with_irr_sources(), .with_irr_route_prefixes(), etc.
• Route prefix collection is opt-in — off by default, saving ~90MB in serialized output
• Unknown ASN names filled from IRR aut-num as-name (363 remaining UNKNOWN out of ~999 gap ASNs)

Breaking changes

• load_asinfo(bool, bool, bool, bool) → load_asinfo_with_profile(AsInfoProfile)
• AsInfo gains delegated: Option<DelegatedInfo> and irr: Vec<IrrAsnInfo> fields
• asinfo feature now depends on irr feature

Performance (live data, release build)

Source	Time
asn.txt only	~1s
Delegated stats (5 RIRs)	~12s
IRR RIPE (4 split files)	~7s
IRR AFRINIC (whole-DB)	~18s (slowest)
IRR RADB (FTP, 25MB)	~10s
All IRR combined	~43s
Full profile	~73s

Output sizes

Profile	Raw JSONL	Gzipped
Production (current)	37 MB	6.3 MB
Full, no routes	160 MB	24 MB
Full, with routes	203 MB	31 MB

Test plan

• 48 lib unit tests pass (including 6 delegated-stats parser tests, 4 IRR streaming tests)
• 4 non-network integration tests pass (source registry coverage, URL correctness, transport verification)
• Live network tests verified: RIPE aut-num (AS13335=Cloudflare, AS15169=Google, AS1299=Arelion), RIPE routes, RADB FTP routes (1.1.1.0/24 via AS13335), ARIN whole-DB, APNIC
• cargo fmt --check clean
• cargo clippy --all-features -- -D warnings clean
• cargo build --no-default-features and --features irr both compile

Closes #38