Add filename and readiness filters to shared media listing

[tulayha]

Extend the existing shared media-listing contract so larger repositories can be narrowed without fetching every page client-side.

Expected behavior:

• Support filename search and readiness/state filtering in the shared application contract.
• Apply the same semantics through CLI, HTTP, and MCP projections.
• Preserve stable pagination and repository scoping.
• Reuse the existing media catalog; do not create a second library index.

[FaiziNerd]

Would Like to Work on this issue as well if nobody is working on this. Would like to give it a shot as the issue is co-related to the issue #82. Do let me know!! Happy to work on this