Feat/phase 12 ai agent capabilities

[neo7337]

This pull request adds foundational support for AI agent and vector store project types and addons in the code generation backend. It extends the project and addon registries, dependency maps, and validation logic to recognize new AI-related options, and stubs out generator implementations for these new features. Additionally, it marks several related tasks as complete in the project documentation.

AI Agent and Addon Support:

• Added "ai-agent" as a supported project type throughout the codebase, including in GeneratorRegistry, SupportedProjectTypesMap, and validation logic in CreateProjectRequest (types.go). [1] [2]
• Registered new AI and vector store addons and their generators in addonRegistry and SupportedAddonsMap, supporting providers such as OpenAI, LangchainGo, Gemini, Ollama, PGVector, Chromem, and Qdrant. [1] [2]
• Extended SupportedFrameworksMap for "ai-agent" to include multiple AI frameworks.

Dependency Management:

• Added versioned dependencies for all new AI and vector store providers in DependencyMap.

Generator Stubs:

• Added stub implementations for AIAgentGenerator, AIAddonGen, and VectorStoreAddonGen, to be implemented in future steps.

Documentation and Task Tracking:

• Updated tasks.md to mark AI agent and addon registry, dependency, and code generation tasks as completed.

Workflow Configuration:

• Temporarily disabled the release workflow trigger, switching from publishing on release to manual dispatch.