Update Power Apps Code Apps instructions: refine project context, improve folder structure, and clarify PowerProvider implementation

[russrimm]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, or skill file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, or skill with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New collection file.
• New skill file.
• Update to existing instruction, prompt, agent, collection or skill.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

This pull request updates the Power Apps Code Apps instructions to reflect the SDK progression from preview version 0.3.1 to general availability version 1.0.3. The changes modernize the development guidance by simplifying the PowerProvider implementation pattern, reorganizing the project structure to better separate generated code, and clarifying the current capabilities and limitations of the platform.

Changes:

• Updated SDK version from 0.3.1 to 1.0.3 and removed "Preview" designation from Power Apps Code Apps
• Reorganized project folder structure to use a generated/ subdirectory for PAC CLI-generated services and models
• Simplified PowerProvider implementation by removing SDK initialization code (no longer required in v1.0)
• Updated platform limitations to accurately reflect Dataverse solutions and Application Insights support
• Refined troubleshooting guidance to align with v1.0 SDK behavior
• Code quality improvements including trailing whitespace removal