vector: weed-vector registers to master; s3 discovers it there (#12146)

* vector: weed-vector registers with the weed master

weed-vector-server --masters holds a KeepConnected stream to the weed
master, the same mechanism filer and s3 use via wdclient — the server
shows up in ListClusterNodes(client_type=vector). Resends registration
and rediscovers on failure.

* vector: s3 discovers weed-vector through the master

With -vectors.grpc unset the vectors gateway resolves one registered
weed-vector via ListClusterNodes on the masters it already derives
from filer config — discovery replaces the static dial for the
single-worker OSS path. The conformance harness registers the engine
to mini's master and drops -vectors.grpc.

* vector: default-fill registration fields

..Default::default() keeps the source compiling against proto variants
that carry extra fields, so the same file works in either tree.

* vector: serve the Vectors API on the main s3 port

The vectors router sits on the main -port listener behind a dispatch
that checks the SigV4 credential scope for /s3vectors/ — no separate
port needed. -port.vectors stays for explicit dedicated-port
deployments; the conformance harness now hits vectors through :8334.

* vector: drop -port.vectors entirely

It was new — no compat to preserve. The main -port listener serves the
API whenever a weed-vector backend is reachable.

* vector: drop -vectors.grpc; discovery is the only locator

weed-vector always registers to master, the gateway always resolves it
through ListClusterNodes — a static address just forks membership.

* vector: binary is weed-vector

Matches the enterprise binary; package and lib names are unchanged.

* vector: review fixes — cluster type, grpc port, lazy resolve, leader hint, advertise

- cluster: register 'vector' as a node type so ListClusterNodes returns
  weed-vector members
- s3: dial masters via ToGrpcAddress (HTTP port + 10000)
- s3: backend resolves lazily through vectorDiscovery — workers joining
  after gateway startup work on first query, and address changes re-dial
- master_client: convert master HTTP addr to grpc +10000, honor http(s)
  scheme, follow the leader hint in KeepConnectedResponse, and
  --advertise covers wildcard/unreachable listen addresses

* vector: no --advertise flag; derive the outbound address

A wildcard listen resolves to the source IP the master sees via a
route lookup, so registration always advertises something reachable
without another flag.

* vector: review fixes — plaintext dispatch, conn leaks, discovery backoff

The two plaintext http servers now serve the vectors dispatch too —
signed s3vectors calls on the main port reach the right router.
discoverVectorWorker closes each master conn and bounds lookups to 5s;
a dead or absent worker no longer re-hits master on every RPC — the
resolver backs off for 5s between rediscovery attempts.

* vector: 1 GiB grpc cap, dead-worker invalidation, CLI rename

Valid PutVectors batches exceed the tonic 4 MiB default — match the
gateway's 1 GiB cap. A replaced worker no longer sticks: any RPC error
resets the cached address and the next call rediscovers through the
master. The core CLI bin renames to weed-vector-cli so the two crates
do not collide on the same output path.

* vector: retry-only-transport reset, periodic re-resolve, cli rename

- reset() takes the failed client and runs only on transport errors —
  an InvalidArgument on a healthy conn no longer interrupts unrelated
  requests, and a concurrent re-resolve wins the race.
- cli() re-resolves once the interval passes even with a live client,
  so a worker that moves addresses is picked up.
- verify.rs spike docs use weed-vector-cli after the bin rename.

* vector: only Unavailable counts as a transport failure

A request deadline or an application error can fire on a healthy
connection — resetting the shared conn on those churned reconnects.

.github/workflows/rust-vector-tests.yml

@@ -120,5 +120,5 @@ jobs:
       - name: Run the s3vectors conformance subset
         working-directory: test/vectors
         run: |
-          cp ../../seaweed-vector/target/release/weed-vector-server weed-vector-server
+          cp ../../seaweed-vector/target/release/weed-vector weed-vector
           ./run_test.sh