Fix README API documentation to match actual implementation

[Copilot]

README.md referenced non-existent API methods (Product(), Route(), Tool(), DimensionWithWeight(), InitializeDefaultDimensions()) that differ from the actual implementation.

Changes

API Method Corrections

• Dimension specification: Replace Product(), Route(), Tool() with Dimension(name, value, matchType)
• Weight override: Replace DimensionWithWeight() with ManualWeight(weight)
• Dimension configuration: Update NewDimensionConfig() signature from (name, index, required, weight) to (name, index, required) + .SetWeight(matchType, weight)
• Bulk weights: Remove default weight parameter from NewDimensionConfigWithWeights()

Example (Before → After)

// Before (incorrect)
engine.InitializeDefaultDimensions()
rule := matcher.NewRule("rule").
    Product("ProductA", matcher.MatchTypeEqual, 10.0).
    DimensionWithWeight("env", "prod", matcher.MatchTypeEqual, 5.0).
    Build()

// After (correct)
engine.AddDimension(matcher.NewDimensionConfig("product", 0, true).
    SetWeight(matcher.MatchTypeEqual, 10.0))
rule := matcher.NewRule("rule").
    Dimension("product", "ProductA", matcher.MatchTypeEqual).
    Dimension("env", "prod", matcher.MatchTypeEqual).
    ManualWeight(15.0).  // Override calculated weight
    Build()

All code examples throughout README updated to match actual API in api.go and types.go.

Original prompt

There are differences between README.md and the actual API, you can refer to index.html for actual usage.

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[Copilot]

Pull Request Overview

This PR updates the README.md documentation to reflect API changes in the matcher library's dimension configuration and weight management system. The changes replace the old constructor-based weight configuration with a builder pattern approach.

Key Changes:

• Updated all code examples to use NewDimensionConfig().SetWeight() builder pattern instead of passing weights as constructor parameters
• Replaced DimensionWithWeight() method with Dimension() + ManualWeight() for explicit weight control
• Changed default weight for unconfigured dimensions from 1.0 to 0.0

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