Connect MinIO and Kibana with authenticated credentials

[Copilot]

MinIO was checked via a plain TCP dial with no credential verification. This adds proper authenticated connectivity checks for both MinIO and Kibana using their respective SDKs/APIs.

Config schema change

config.yml now has dedicated top-level sections for authenticated services alongside the generic services: block for TCP checks:

services:          # TCP checks (unchanged behaviour)
  redis:
    - 10.0.1.38:6379
  kafka:
    - 10.0.1.30:9092
  zookeeper:
    - 10.0.1.27:2181,10.0.1.28:2181,10.0.1.29:2181

minio:             # Authenticated S3 API check
  username: minioadmin
  password: minioadmin
  use_ssl: false   # set true for TLS endpoints
  addresses:
    - 10.0.1.35:9000

kibana:            # Authenticated HTTP check
  addresses:
    - 10.0.1.26:5601
  username: elastic
  password: changeme

Key changes

• config/config.go — Added MinioConfig struct (username, password, use_ssl, addresses), KibanaConfig struct (addresses, username, password), and AppConfig wrapper replacing the flat NetworkConfig as the top-level type.
• checker/minio.go — New checker that calls ListBuckets via minio-go/v7, verifying both reachability and credential validity within the configured timeout.
• checker/checker.go — Added CheckKibanaConnection that performs an HTTP GET to /api/status with basic auth, verifying both reachability and credential validity.
• main.go — TCP service loop now iterates cfg.Services; ZooKeeper uses the ruok/imok four-character command checker; MinIO and Kibana each run separate authenticated loops. Extracted recordResult helper to eliminate duplicated result-recording logic.
• go.mod — Added github.com/minio/minio-go/v7 v7.0.80 (minimum Go 1.22, consistent with existing module).

[alanthssss]

LGTM

[alanthssss]

@copilot solve the merge conflicts

[Copilot]

@copilot solve the merge conflicts

Merge conflicts resolved in commit 09aa7cc. The ZooKeeper PR (#10) changes are now integrated — config.yml uses the connection-string format for ZooKeeper under the services: key, and main.go routes ZooKeeper addresses through CheckZookeeperConnection while MinIO uses the authenticated check.

[alanthssss]

@copilot solve the merge conflicts

[Copilot]

@copilot solve the merge conflicts

Merge conflicts resolved in commit 8039939. The Kibana HTTP auth PR (#12) changes are now integrated — KibanaConfig is added to AppConfig alongside MinioConfig, config.yml has Kibana under its own top-level kibana: key with addresses/username/password, and the Kibana check in main.go uses the recordResult helper for consistency.

[alanthssss]

LGTM