fix(docs): llms.txt stale redb refs + router path (#2 #3)

[Destynova2]

Phoenix audit 2026-04-20 Tier 3 quick win :

• chore: release v0.7.1 #3 ADR-0004 description : 'Why redb for spend tracking' → 'Persistent spend tracking (superseded by ADR-0013)'
• chore: release v0.7.1 #3 Storage description : 'Unified redb storage backend' → 'Atomic files + JSONL journals backend, AES-256-GCM at rest'
• chore: release v0.7.1 #2 Router path : 'src/router/mod.rs' → 'src/routing/classify/mod.rs' (post T-VS PR refactor(structure): VS foundation — fuse router into routing/classify, move root modules to shared/ #230)

3 lignes modifiées, pas de code impact.