fix: reduce default HPM logging

[chenjiahan]

HTTP proxy middleware logs every successful proxied request at info, making the default dev-server output noisy. This change routes default HPM info messages through infrastructure log while preserving warnings, errors, and custom proxy loggers. Users can opt back in with infrastructureLogging.level: 'log' or 'verbose'.

[Copilot]

Pull request overview

This PR reduces default console noise from http-proxy-middleware (HPM) by downgrading HPM’s default “successful request” logging from infrastructure info to infrastructure log, while keeping warnings/errors and respecting any user-supplied proxy logger.

Changes:

• Introduce a default proxy logger that routes HPM info messages through this.logger.log, preserving warn/error.
• Keep custom proxy.logger behavior unchanged (only apply the default when proxyOptions.logger is undefined).
• Add an E2E test suite validating default vs infrastructureLogging.level: 'log' behavior and custom logger preservation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/server.ts	Adds a defaultProxyLogger to reduce default HPM success-request logging verbosity while preserving warnings/errors and custom loggers.
tests/e2e/proxy-logging.test.js	Adds E2E coverage to ensure successful proxy requests are not logged at default level, are logged at log level, and that custom proxy loggers still work.

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