refactor(ReactExperienceAgentHook): update hooks' priority

[canfuu]

This pull request introduces a new priority constant for the React Experience Hook and updates the ReactExperienceAgentHook class to ensure it executes before the Quick Intent Hook. This change helps guarantee that React strategy experience is injected early in the agent lifecycle, influencing all subsequent hooks.

Hook priority management:

• Added a new priority constant REACT_EXPERIENCE_HOOK (value 20) to HookPriorityConstants, with documentation specifying its purpose and execution order in the beforeAgent phase.
• Updated ReactExperienceAgentHook to implement the Prioritized interface and override getOrder() to return the new priority constant, ensuring it runs before the Quick Intent Hook (priority 50). [1] [2]

Imports and documentation:

• Added necessary imports for HookPriorityConstants and Prioritized in ReactExperienceAgentHook.java.
• Enhanced class-level documentation in ReactExperienceAgentHook to clarify the hook's priority and execution order.

[Copilot]

Pull request overview

Updates hook ordering so the React strategy “experience” injection runs earlier in the REACT agent lifecycle (before the Fast/Quick Intent hook), ensuring downstream hooks see the injected behavior guidance.

Changes:

• Introduced HookPriorityConstants.REACT_EXPERIENCE_HOOK = 20 for beforeAgent ordering.
• Updated ReactExperienceAgentHook to implement Prioritized and return the new priority via getOrder().
• Expanded Javadoc to document intended ordering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
assistant-agent-extensions/src/main/java/com/alibaba/assistant/agent/extension/experience/hook/ReactExperienceAgentHook.java	Makes the hook prioritized and documents its intended execution order.
assistant-agent-common/src/main/java/com/alibaba/assistant/agent/common/constant/HookPriorityConstants.java	Adds a new priority constant for React experience injection in beforeAgent.

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[AQing-527]

LGTM