fix!(server): cast off deprecated API

[Copilot]

Fix echo's deprecated API usage

This PR fixes the deprecated middleware.LoggerWithConfig API usage by replacing it with middleware.RequestLoggerWithConfig.

Changes:

• Replace deprecated middleware.LoggerWithConfig with middleware.RequestLoggerWithConfig in server/server.go
• Add newRequestLoggerConfig helper function to configure the new logger with JSON output format
• Add required imports (encoding/json, io, strconv, time)
• Test the changes - all tests pass
• Run linter and fix any issues - no new linting issues
• Fix pre-existing golangci-lint prealloc error in fetcher/exploitdb.go
• Run code review - no issues found
• Run security checks - no vulnerabilities found

Implementation Details:

• Replaced middleware.LoggerWithConfig(middleware.LoggerConfig{Output: ...}) with middleware.RequestLoggerWithConfig(newRequestLoggerConfig(...))
• Added newRequestLoggerConfig function that returns a properly configured middleware.RequestLoggerConfig with JSON logging format
• Maintains same log output format as before with JSON structure
• Fixed pre-existing prealloc lint issue by calculating total size before slice allocation (commit 123f86b)
• Follows the exact pattern from the reference PR: fix!(server): cast off deprecated API go-cpe-dictionary#265

Security Summary:

No security vulnerabilities were discovered or introduced by these changes.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix echo's deprecated API usage</issue_title>
<issue_description>- CI error to be fixed: https://github.com/vulsio/go-exploitdb/actions/runs/20422302160/job/58676236713?pr=294

• Almost the same diff will work, I hope: fix!(server): cast off deprecated API go-cpe-dictionary#265
• The commit message must be the same as the above PR's one.
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix echo's deprecated API usage #296

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[shino]

@copilot Fix CI error https://github.com/vulsio/go-exploitdb/actions/runs/21618750013/job/62304869322?pr=297

[Copilot]

@copilot Fix CI error https://github.com/vulsio/go-exploitdb/actions/runs/21618750013/job/62304869322?pr=297

Fixed the CI error. The issue was a pre-existing golangci-lint prealloc warning in fetcher/exploitdb.go (line 587). Preallocated the exploits slice by calculating the total size before allocation. Commit: 123f86b