refactor(tui): move client-side filtering to daemon API (orch-395)

[proboscis]

Summary

• Extended ListRunsRequest proto with new filter fields: branch_state, pr_filter, issue_status, updated_within_seconds
• Added PRFilter enum to proto for PR filtering (ALL, HAS, NONE)
• Implemented server-side filtering in daemon's proto_handler.go
• Updated TUI to pass all filter parameters to daemon API via buildListRunsFilter()
• Removed FilterRows function from run_filter.go (previously lines 319-383)

Changes

• api/orch.proto: Added filter fields and PRFilter enum
• internal/daemon/proto_handler.go: Added applyExtendedRunFilters() for server-side filtering
• internal/daemon/proto_client.go: Added ListRunsWithFilter() method
• internal/orchapi/types.go: Extended ListRunsFilter struct
• internal/orchapi/daemon_client.go: Updated to use new filter method
• internal/monitor/monitor.go: Updated loadRuns() and Refresh() to use server-side filtering
• internal/monitor/run_filter.go: Removed FilterRows function
• internal/monitor/run_filter_test.go: Removed tests for FilterRows

Verification

• All packages build: go build ./...
• Monitor tests pass: go test ./internal/monitor/...
• FilterRows function removed from run_filter.go
• TUI passes filters to daemon API instead of filtering client-side

Closes orch-395