Fix/issues 277 281

[Silasdotmd]

Fix pagination and retention hardening for intent endpoints

This PR addresses the unbounded listing and retention issues across the intent APIs while keeping the changes narrow and consistent with the existing codebase patterns.

Summary

• Adds pagination to GET /api/v1/intents/open and GET /api/v1/intents/user/:address using the existing ListIntentsDto validation rules, capped at 100 results.
• Returns a paginated envelope consistent with the main intent listing: { intents, total, limit, offset }.
• Keeps the older count field as a compatibility alias where relevant.
• Adds a configurable in-memory retention sweep for stale terminal-state intents (filled, cancelled, expired, slashed) to prevent unbounded memory growth.
• Exposes a solver-capability endpoint: GET /api/v1/solvers/:address/eligible-intents, filtering currently open intents by the solver's declared chain/token support.
• Adds pagination to GET /api/v1/intents/:id/audit while preserving the oldest-first log ordering and returning total / limit / offset metadata.
• Documents the behavior change in CHANGELOG.md.

Closes

• Closes Add pagination to the unbounded listByUser and listOpen intent endpoints #277
• Closes Add bounded archival/eviction for terminal-state intents in the in-memory store #278
• Closes Add a solver-facing eligible-intents recommendation endpoint #279
• Closes #72 [High] Add cursor/pagination to the intent audit-log endpoint #281

Notes

• The pagination defaults are bounded and safe for existing callers.
• Retention only applies to the in-memory adapter and is a no-op when the durable backend is active.
• Scope is intentionally limited to the listed issues and avoids unrelated churn.

Validation

• The repo has unrelated baseline issues that prevent a clean full-project typecheck from succeeding, so I kept the fix tight and targeted to the requested issue set and performed focused smoke checks around the changed logic.

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