Renamed the Web package as Infrastructure (#25)

This PR contains the work done to rename the _Web_ package as _Infrastructure_, to provide a clear naming and purpose to this particular package within the project.

To provide further details about the work:

* Infrastructure
  * Asset fingerprinting: an FNV-1a token derived from the static files directory, appended as ?v= to asset URLs so deploys bust caches; pre-rendered pages also revalidate via weak ETags.
  * New middlewares: fixed-window RateLimitMiddleware (per-client budgets keyed by trusted X-Forwarded-For or remote address) and VaryMiddleware (Accept-Encoding on every response); SecurityHeadersMiddleware now also stamps error responses.
  * Auto-generated HEAD endpoints, cache max-age configuration, and Docker build/Compose refinements.
  * Protocols and scaffolding: Asset/AssetExtension, the Page protocol (viewport, stylesheets, scripts, versioned URLs), and LocalizedRequestContext.
  * Rate limiter's counter store swapped from an actor to a Mutex (no executor hop per request) with amortized batch eviction instead of O(n²) scans under client floods.
  * FingerprintAssets reports unreadable files to a logger instead of silently producing a token that never busts their cache.

Reviewed-on: rock-n-code/loud-amsterdam#25
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Packages/Infrastructure/Sources/Public/Middlewares/LocalizationMiddleware.swift

@@ -0,0 +1,60 @@
+import Foundation
+import HTTPTypes
+import Hummingbird
+import Localization
+
+/// Resolves the visitor's preferred language and records it on the request context.
+///
+/// Placed ahead of the localized responders in the middleware chain, it reads the request's
+/// `Accept-Language` header, negotiates the best supported match (falling back to the default
+/// language), and stores it on the context's ``LocalizedRequestContext/language``.
+///
+/// The request is otherwise passed through untouched — the URL and routing are not affected — so
+/// each page is served at its existing path and varies its content by header.
+public struct LocalizationMiddleware<Context: LocalizedRequestContext> {
+
+    // MARK: Properties
+
+    /// Negotiates the request's language from its `Accept-Language` header.
+    private let negotiate: Negotiate
+
+    // MARK: Initializers
+
+    /// Creates a localization middleware that negotiates against the given bundle's String Catalog languages.
+    /// - Parameter bundle: the bundle whose String Catalog names the supported languages.
+    public init(
+        bundle: Bundle
+    ) {
+        self.negotiate = .init(bundle: bundle)
+    }
+
+}
+
+// MARK: - RouterMiddleware
+
+extension LocalizationMiddleware: RouterMiddleware {
+
+    // MARK: Functions
+
+    /// Negotiates the request's language and records it on the context before passing it down.
+    /// - Parameters:
+    ///   - request: the incoming request.
+    ///   - context: the context the request is resolved against.
+    ///   - next: the next responder in the middleware chain.
+    /// - Returns: the downstream response.
+    /// - Throws: any error thrown downstream.
+    public func handle(
+        _ request: Request,
+        context: Context,
+        next: (Request, Context) async throws -> Response
+    ) async throws -> Response {
+        var context = context
+
+        context.language = negotiate(
+            acceptLanguage: request.headers[.acceptLanguage]
+        )
+
+        return try await next(request, context)
+    }
+
+}