feat: Add URL pattern matching and masking utilities

[yceffort-naver]

Background

URL path parameters can contain sensitive information (e.g., user IDs, member numbers). We need utilities to:

1. Match a URL against a pattern and extract parameters
2. Mask sensitive parameters in URLs

Proposal

1. NURL.match(url, pattern)

Extract parameters from a URL by matching against a pattern.

NURL.match('/v1/user/12345/info', '/v1/user/:userId/info')
// → { userId: '12345' }

NURL.match('/v1/friends/SENDMONEY/block/111/222', '/v1/friends/:serviceCode/block/:nidNo/:friendNidNo')
// → { serviceCode: 'SENDMONEY', nidNo: '111', friendNidNo: '222' }

NURL.match('/v1/user/12345', '/v1/admin/:id')
// → null (no match)

2. NURL.mask(url, options)

Mask sensitive path parameters in a URL.

interface MaskOptions {
    patterns: string[]
    sensitiveParams: string[]
    maskChar?: string         // default: '*'
    maskLength?: number       // default: 4
    preserveLength?: boolean  // default: false, overrides maskLength if true
}

Examples:

// Default masking (**** with length 4)
NURL.mask('/v1/user/12345/info', {
    patterns: ['/v1/user/:userId/info'],
    sensitiveParams: ['userId'],
})
// → '/v1/user/****/info'

// Custom mask character and length
NURL.mask('/v1/user/12345/info', {
    patterns: ['/v1/user/:userId/info'],
    sensitiveParams: ['userId'],
    maskChar: 'X',
    maskLength: 6,
})
// → '/v1/user/XXXXXX/info'

// Preserve original value length
NURL.mask('/v1/user/12345/info', {
    patterns: ['/v1/user/:userId/info'],
    sensitiveParams: ['userId'],
    preserveLength: true,
})
// → '/v1/user/*****/info' (5 chars, same as '12345')

// Multiple sensitive params
NURL.mask('/v1/friends/SENDMONEY/block/12345/67890', {
    patterns: ['/v1/friends/:serviceCode/block/:nidNo/:friendNidNo'],
    sensitiveParams: ['nidNo', 'friendNidNo'],
    preserveLength: true,
})
// → '/v1/friends/SENDMONEY/block/*****/*****' (5 and 5 chars)

Pattern Syntax

Support both existing syntaxes that NURL already recognizes:

Syntax	Example
:variable	/user/:id
[variable]	/user/[id]