fix: improve Secret API routes and error handling

[kearen001]

What type of PR is this?
/kind bug
/kind api-change
/kind cleanup

What this PR does / why we need it:
This PR improves the Secret API handler to make it more consistent and user-friendly:

• Change PUT route to /secret/{namespace}/{name} for REST consistency
• Return correct HTTP status codes:
  • 201 Created for POST
  • 404 Not Found when secret does not exist
  • 409 Conflict when secret already exists
• Add klog logging for error cases
• Default to NamespaceAll when namespace is empty in GET
  Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

• This change aligns Secret API routes with Kubernetes API conventions
• Tested locally with GET/POST/PUT/DELETE requests
  Does this PR introduce a user-facing change?:

Secret API routes and error handling improved:
- PUT now requires `/secret/{namespace}/{name}`
- Proper status codes returned (201/404/409)
- Logs added for better debugging
- GET without namespace returns all namespaces
```release-note

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Summary of Changes

Hello @kearen001, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refines the Secret API by enhancing its consistency, error handling, and user-friendliness. The changes ensure that API routes adhere more closely to REST principles, provide clearer feedback through appropriate HTTP status codes, and improve debuggability with added logging. Additionally, it streamlines the retrieval of secrets by defaulting to all namespaces when none is specified, making the API more robust and intuitive for developers.

Highlights

• API Route Consistency: The PUT route for Secret API has been updated to /secret/{namespace}/{name} to align with RESTful conventions, requiring both namespace and name for updates.
• Improved Error Handling and Status Codes: The API now returns more precise HTTP status codes: 201 Created for successful POST requests, 404 Not Found when a secret does not exist (for GET, PUT, DELETE), and 409 Conflict when attempting to create a secret that already exists.
• Enhanced Logging: Added klog logging for various error cases across GET, POST, PUT, and DELETE operations, improving debuggability and operational visibility.
• Default Namespace for GET Requests: GET requests for secrets will now default to NamespaceAll if no specific namespace is provided, allowing for easier retrieval of secrets across all namespaces.
• Documentation Update: The README.md file has been updated to include a 'Notice' section regarding the --apiserver-skip-tls-verify option for self-signed certificates.

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[gemini-code-assist]

Code Review

This pull request significantly improves the Secret API handlers by aligning with REST principles, enhancing error handling with correct HTTP status codes, and adding valuable logging. The changes make the API more robust and easier to debug.

However, there is a critical issue. The API for updating a secret has changed from PUT /secret/{namespace} to PUT /secret/{namespace}/{name}, but the frontend code in modules/web/src/api/secret.ts has not been updated to use the new route. This will break the secret update functionality in the UI and must be addressed.

I have also added one review comment with a suggestion to make the handleCreateSecret function more robust by enforcing the namespace from the URL path, consistent with the approach in handleUpdateSecret.

Please address the frontend API call and consider the suggestion for the create handler.

[gemini-code-assist]

For robustness, it's good practice to enforce that the secret's namespace matches the namespace from the URL path, similar to how it's done in handleUpdateSecret. If a client sends a request body with a different namespace, the Kubernetes API server will reject it. Explicitly setting the namespace from the path parameter makes the API behavior clearer and more predictable.

Suggested change

	namespace := request.PathParameter("namespace")
	namespace := request.PathParameter("namespace")
	data.Namespace = namespace

[kubeedge-bot]

@kearen001: PR needs rebase.

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