Feature/init crewai langgraph templates

[rishabh998186]

Hey! This PR adds support for CrewAI and LangGraph frameworks to the kagent init command. Now developers can choose which framework they want to use when creating new agent projects, instead of being locked into just ADK.

I've added two new framework options that work alongside the existing ADK support. Users can now run:

kagent init my-agent --framework crewai
kagent init my-agent --framework langgraph

Each framework gets its own complete project setup with all the necessary files - Python code, Dockerfiles, configs, and a helpful README with usage examples. The templates are framework-specific, so CrewAI projects get crew.py files and LangGraph projects get graph.py files.

I also simplified the CLI while I was at it. Instead of requiring three arguments, it now just needs the agent name plus optional flags. The --framework flag defaults to "adk" so existing workflows won't break.

The implementation uses a registry pattern under the hood, which should make it easier to add more frameworks down the line if needed.

Closes #1049

[peterj]

I lose a lot of confidence in PRs when I try to build the binary, and the basic build fails. Did you test all commands and made sure it all works as it should?

❯  go build cli/cmd/kagent/main.go 
# github.com/kagent-dev/kagent/go/cli/internal/agent/frameworks/common
cli/internal/agent/frameworks/common/base_generator.go:4:2: "io/fs" imported and not used
cli/internal/agent/frameworks/common/base_generator.go:50:2: declared and not used: tmpl
cli/internal/agent/frameworks/common/base_generator.go:50:15: undefined: template
cli/internal/agent/frameworks/common/base_generator.go:56:14: undefined: fmt
cli/internal/agent/frameworks/common/base_generator.go:58:1: missing return

[rishabh998186]

@peterj
Let me address your suggestions and get the GitHub checks passing, then I test everything thoroughly (init, build, deploy, and run for all three frameworks) and then i report back you with the results.

[peterj]

another thing I noticed -- there's missing docker compose files in the template folder which means kagent run won't work.

[rishabh998186]

I Created Docker-compose.yaml.tmpl for both LangGraph and crewAI copied from ADK framework template

[rishabh998186]

@peterj, when you get a chance, could you review my PR and let me know if there are any changes needed

[rishabh998186]

hey @peterj
All CI/CD checks are passing now PR is ready for review.

[rishabh998186]

These changes are from running go fmt to ensure the code follows Go's standard formatting conventions (indentation, spacing, code consistency). These changes are purely cosmetic and don't affect the framework implementation at all.