mvp phase γ: delete entire asap-planner-rs workspace member

[zzylol]

Summary

Phase γ of the planner consolidation: delete the entire asap-planner-rs/ workspace member (library + CLI). Phase α (#96) made the ASAPCollector controller the sole emitter of BackendStorageRouting; Phase β migrated all 5 PromQL pattern matchers and 11 archive-only intents into the controller; Step 2.3 (#97) wired the backend to forward archive queries to thanos-query. The library code in this repo is now redundant, and earlier scope kept the CLI binary — that constraint has been rescinded.

• Delete asap-planner-rs/ directory — 49 files, ~5.1k LOC (src, tests, Cargo.toml, Dockerfile, installation/, controller-cli-compose.yml.j2, docker-compose.yml.j2).
• Drop the workspace member + workspace internal dep in the root Cargo.toml.
• Surgically remove the only remaining backend importer in asap-query-engine:
  • src/planner_client.rs (the LocalPlannerClient bridge that called asap_planner::Controller::generate() from the backend's tracker).
  • src/query_tracker/ (passive auto-discovery loop that drained PromQL queries and called the planner client). Both are superseded by the controller observing queries via its own scrape side-channel and pushing plans / routing tables back via POST /api/v1/streaming-config and POST /api/v1/storage_routing.
  • --enable-query-tracker / --tracker-observation-window-secs CLI flags and the asap_planner workspace dependency on asap-query-engine.
  • HttpServer::new loses its Option<Arc<QueryTracker>> arg; record_instant / record_range hooks in instant- and range-query handlers are removed.
  • asap-query-engine/Dockerfile no longer COPYs asap-planner-rs sources or stubs them in the dependency cache layer.
• Refresh README.md, asap-quickstart/, asap-summary-ingest/README.md, and docs/ to point at the canonical planner location (ASAPCollector/controller/).
• asap-quickstart/docker-compose.yml and benchmarks/docker-compose.yml continue to reference the published ghcr.io/projectasap/asap-planner-rs:v0.2.0 image; that's an external artifact that still works. The Phase δ rewrite of the quickstart will replace the init container with a controller HTTP push.

Test plan

• cargo build --release is green (workspace and individual crate).
• cargo test --release --lib shows the same 34 pre-existing failures as origin/main; no new test regressions introduced by this PR.
• No source file in any retained workspace member still imports asap_planner::*.
• Auto-merge if CI is green (CI is not configured in this repo today; build + test verified locally).

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