feat(Docker): Upgrade to PHP 8.5.0RC3 with native ext-uri support

BREAKING CHANGE: Requires PHP 8.5.0RC3

Changes:
- Update Docker base image from php:8.4-fpm to php:8.5.0RC3-fpm
- Enable ext-uri for native WHATWG URL parsing support
- Update composer.json PHP requirement from ^8.4 to ^8.5
- Add ext-uri as required extension in composer.json
- Move URL classes from Url.php85/ to Url/ directory (now compatible)
- Remove temporary PHP 8.4 compatibility workarounds

Benefits:
- Native URL parsing with Uri\WhatWg\Url class
- Better performance for URL operations
- Future-proof with latest PHP features
- Eliminates PHP version compatibility issues

src/Framework/Http/Url.php85/UrlSpec.php

@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Http\Url;
+
+/**
+ * URL Specification identifier
+ *
+ * Distinguishes between RFC 3986 and WHATWG URL Standard
+ * for different parsing and handling semantics.
+ */
+enum UrlSpec: string
+{
+    /**
+     * RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax
+     *
+     * Use for:
+     * - Server-side URL canonicalization
+     * - API clients (REST, GraphQL, SOAP)
+     * - URL signatures and validation
+     * - cURL compatibility
+     * - File system paths
+     *
+     * Characteristics:
+     * - Strict parsing rules
+     * - No automatic encoding
+     * - No URL normalization
+     * - Preserves original structure
+     *
+     * Example:
+     * ```php
+     * $uri = Rfc3986Url::parse('https://api.example.com/users?id=123');
+     * ```
+     */
+    case RFC3986 = 'rfc3986';
+
+    /**
+     * WHATWG URL Standard (Living Standard)
+     *
+     * Use for:
+     * - Browser-like URL handling
+     * - Deep links and redirects
+     * - Client-side generated URLs
+     * - HTML form actions
+     * - JavaScript fetch() API compatibility
+     *
+     * Characteristics:
+     * - Living standard (matches modern browsers)
+     * - Automatic percent-encoding
+     * - URL normalization
+     * - Special scheme handling (http, https, file, etc.)
+     *
+     * Example:
+     * ```php
+     * $url = WhatwgUrl::parse('https://example.com/redirect');
+     * ```
+     */
+    case WHATWG = 'whatwg';
+
+    /**
+     * Get recommended spec for specific use case
+     *
+     * Automatically selects the appropriate URL specification
+     * based on the intended usage pattern.
+     */
+    public static function forUseCase(UrlUseCase $useCase): self
+    {
+        return match ($useCase) {
+            UrlUseCase::API_CLIENT,
+            UrlUseCase::CURL_REQUEST,
+            UrlUseCase::SIGNATURE_GENERATION,
+            UrlUseCase::CANONICAL_URL => self::RFC3986,
+
+            UrlUseCase::BROWSER_REDIRECT,
+            UrlUseCase::DEEP_LINK,
+            UrlUseCase::HTML_FORM_ACTION,
+            UrlUseCase::CLIENT_SIDE_URL => self::WHATWG,
+        };
+    }
+
+    /**
+     * Check if this spec is RFC 3986
+     */
+    public function isRfc3986(): bool
+    {
+        return $this === self::RFC3986;
+    }
+
+    /**
+     * Check if this spec is WHATWG
+     */
+    public function isWhatwg(): bool
+    {
+        return $this === self::WHATWG;
+    }
+}