docs(architecture): accuracy corrections for all addon architecture pages

[weicao]

Summary

Cross-checked every addon architecture page against the actual ComponentDefinition YAML in kubeblocks-addons and kubeblocks core. A number of inaccuracies were found and corrected.

Changes

Container / init-container alignment

• MongoDB: removed non-existent dbctl (kbagent) container from diagrams and prose; roleProbe is exec /tools/syncerctl getrole in the mongodb container; init-syncer init container documented
• Redis Cluster: removed kbagent :5001; roleProbe is exec /tools/dbctl redis getrole in redis-cluster; init-dbctl init container documented
• PostgreSQL: dbctl is an addon-declared sidecar, not kbagent; label corrected in prose and diagram; kbprobe account description clarified (health checks only, not role detection)
• Qdrant: added qdrant-tools init container (copies jq + curl)
• etcd: added inject-bash init container
• Redis Sentinel + Cluster: added init-dbctl init container note
• MongoDB Sharding / Mongos: added init-kubectl init container note
• MySQL Semisync: enumerated all four init containers (init-syncer, init-data, init-xtrabackup, init-jemalloc); MGR: three init containers (no xtrabackup)
• Milvus Distributed: added setup init container
• Elasticsearch: added three init containers (prepare-plugins, install-plugins, install-es-agent)

ClickHouse

• Coordinator is ClickHouse Keeper (ch-keeper), not ZooKeeper — corrected throughout prose and diagram
• Shard component names use a random 3-char suffix (e.g. clickhouse-x7k), not deterministic -0/-1; shardTemplates[].shardIDs documented for predictable names
• Two topologies: standalone (sharding only) and cluster (ch-keeper + sharding)
• Removed non-existent dbctl + ch-exporter containers; single clickhouse container with correct ports

RocketMQ

• Default mode is ASYNC_MASTER/SLAVE, not DLedger; DLedger moved to a note as opt-in
• Removed non-existent broker ClusterIP service; added per-shard headless service
• Added exporter and dashboard components to topology table
• Broker pods: jmx-exporter :5556 + agent :8999

MinIO

• Metrics at /minio/v2/metrics/cluster on port 9000; no HTTP liveness/readiness probes — addon uses exec roleProbe (mc admin info) → readwrite/notready
• System accounts: only root (initAccount)
• Production: minimum 4 replicas, must be multiple of 2

Redis Cluster

• Shard names shard-0/1/2 are simplified examples; added note that KubeBlocks assigns a random 3-char suffix; referenced shardTemplates[].shardIDs

Elasticsearch

• Removed version-specific claim "8.x (the version used by this addon)"; addon ships ComponentDefinitions for 6.x, 7.x, and 8.x
• Replaced "gossip-based discovery mechanism" with "quorum-based master election"
• Replaced "cluster state gossip" with "cluster state synchronization"

ZooKeeper

• Observer role: clarified it is not part of the default addon deployment; requires explicit zoo.cfg configuration

All changes applied to both docs/en/preview/ and docs/en/release-1_0_2/.

[weicao]

Commit 910d34b was pushed directly to main. All changes are live.