Multiple URL paths with weights

[FumingPower3925]

Problem

The load generator benchmarks a single URL path. Real-world traffic hits multiple endpoints with different frequencies.

Solution

Add support for multiple paths with weighted distribution:

type PathConfig struct {
    Path   string  // URL path (e.g., "/api/users")
    Weight float64 // Relative weight (e.g., 0.7 for 70% of requests)
    Method string  // HTTP method (default: GET)
    Body   []byte  // Request body (for POST/PUT)
}

type Config struct {
    // Paths defines multiple URL paths with weighted distribution.
    // If empty, uses URL path (default: "/").
    // Weights are relative and normalized internally.
    Paths []PathConfig
}

Distribution: weighted round-robin or random selection based on weights.

Acceptance Criteria

• Multiple paths supported
• Weights control distribution
• Per-path results in output
• CLI flag: -path "/api:70,/health:30"

Future

This is a post-v1.0.0 feature.