refactor(query): replace analyzer routing with BackendPlan DAG resolver

[zzylol]

Summary

• remove the legacy ASAPTierCandidate analyzer from both instant and range warm-routing paths
• route each warm query through one authoritative pipeline: ASAPPlanner post-ASAP DAG, BackendPlan materialization validation, SID resolution, and recursive DAG execution
• derive instant lookback, cumulative readout, and full-history sum semantics from Planner IR instead of analyzer fields
• preserve safe fallback for rate/irate, counter sum_over_time, keyed frequency, unsupported DAG operators, missing routes, missing SIDs, and family/parameter mismatches
• return typed resolver/executor reasons through CapabilityMiss so EngineRouter falls through to Thanos
• preserve capability-miss notifications and the warm/archive coverage stitch

Verification

• cargo test -p data_plane query_engines::asap_query_engine --lib (90 passed)
• cargo test -p control_plane --lib (688 passed)
• cargo test -p data_plane --test e2e_controller_plans_and_backend_serves controller_really_pushes_backend_plan_and_query_really_serves (passed)
• git diff --check
• no ASAPTierCandidate/analyze_promql_for_asap_tier/find_matching_policies references remain in the query-engine serving path

A stricter local cargo clippy -D warnings remains blocked by pre-existing control-plane warnings outside this change.

Stack

Depends on #467.