[AINode] More accurate exceptions

[yunbow30944]

This pr adds more accurate exceptions for AINode.

[CRZbulabula]

LGTM!

[Copilot]

Pull request overview

This PR introduces a dedicated AINodeConnectionException to replace generic exception handling when connecting to AINode fails, improving exception clarity and consistency across the codebase. It also adds validation to prevent duplicate device IDs in load/unload model operations.

Changes:

• Created new AINodeConnectionException class with a descriptive error message for AINode connection failures
• Replaced generic IoTDBRuntimeException and ModelInferenceProcessException with AINodeConnectionException in multiple AINode client interaction points
• Added duplicate device ID validation in Python handler for load/unload model operations with corresponding error codes (1509, 1510)

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
AINodeConnectionException.java	New exception class for AINode connection failures with standardized error message
UDTFForecast.java	Replaced generic exception with AINodeConnectionException in forecast method
ForecastTableFunction.java	Replaced generic exception with AINodeConnectionException in forecast method and removed unused import
ClassifyTableFunction.java	Replaced generic exception with AINodeConnectionException in classify method and removed unused import
ClusterConfigTaskExecutor.java	Replaced generic exceptions with AINodeConnectionException in 8 model management methods
InferenceOperator.java	Replaced ModelInferenceProcessException with AINodeConnectionException in inference task submission
handler.py	Added duplicate device ID validation for loadModel and unloadModel operations
constant.py	Added new error codes LOAD_MODEL_ERROR (1509) and UNLOAD_MODEL_ERROR (1510)
AINodeInstanceManagementIT.java	Added integration tests for duplicate device ID validation

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