docs(opc): support server address failover

[bitcapybara]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request updates the Chinese documentation for OPC-UA data ingestion within TDengine TSDB. The primary goal is to improve the clarity and robustness of OPC-UA server connections by detailing the configuration of both primary and failover server addresses. This enhancement ensures users can better manage their OPC-UA data sources, especially in scenarios requiring high availability.

Highlights

• OPC-UA Service Address Clarification: The documentation for the "OPC-UA 服务地址" (OPC-UA Service Address) has been updated to provide a more detailed example (127.0.0.1:6666/OPCUA/ServerPath) and clarify accessibility requirements, specifying whether the address must be reachable from an Agent or the TDengine system server.
• Failover Service Address Support: A new configuration option, "故障切换服务地址" (Failover Service Address), has been introduced, allowing users to specify multiple OPC server failover endpoints, separated by commas, to enhance connection resilience.

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[zitsen]

/gemini review

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