Replace simple path prefix-based enforcement/bypass mechanism with a more
flexible function-based approach. This allows for more complex conditions
to determine when middleware should be enforced or bypassed.
- Add checkReqFunc and checkRespFunc types for flexible condition checking
- Replace enforcedPathPrefixes with separate enforce and bypass check functions
- Add static asset path detection for automatic bypassing
- Separate request and response check logic for better granularity
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