fix(server): normalize trailing slashes so /health/ returns 200

[hibare]

Summary

Adds path normalization middleware to strip trailing slashes from request URLs before they reach downstream handlers and middleware. This ensures endpoints like /health/ return 200 instead of 404, and that all path-aware middleware (loggers, telemetry, heartbeat checks) observe a single canonical path.

What Changed

• Added NormalizePath middleware that strips trailing slashes from r.URL.Path and r.URL.RawPath
• Middleware performs shallow request cloning when normalization is needed, avoiding mutation of the original request
• Preserves root path / unchanged
• Added comprehensive test suite covering normalization behavior, request immutability, and edge cases
• Integrated middleware into server initialization

Technical Details

Chi's built-in middleware.StripSlashes only modifies the routing context, not the actual URL path. Middleware that reads r.URL.Path directly (structured loggers, OpenTelemetry span formatters, heartbeat checks) continue to see unnormalized paths with trailing slashes. This middleware normalizes the URL at the top of the handler chain so all downstream components see consistent paths.

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

[arber-salihi]

Look good to me.