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>

Services/Website/Tests/Library/Cases/Public/Middlewares/NotFoundMiddlewareTests.swift

@@ -3,6 +3,8 @@ import HummingbirdTesting
 import NIOCore
 import Testing
 
+import Infrastructure
+
 @testable import WebsiteLibrary
 
 @Suite("NotFoundMiddleware middleware", .tags(.middleware))
@@ -70,11 +72,102 @@ struct NotFoundMiddlewareTests {
                 method: .get
             ) { response in
                 let body = String(buffer: response.body)
-                
+
                 #expect(response.status == .badRequest)
                 #expect(!body.contains("Page Not Found"))
             }
         }
     }
 
+    @Test
+    func `renders versioned asset URLs when given a version`() async throws {
+        try await app(
+            assetVersion: "0123456789abcdef"
+        ).test(.router) { client in
+            try await client.execute(
+                uri: "/this-path-does-not-exist",
+                method: .get
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(body.contains("/css/error.css?v=0123456789abcdef"))
+                #expect(body.contains("/js/shared.js?v=0123456789abcdef"))
+            }
+        }
+    }
+
+    @Test
+    func `renders unversioned asset URLs by default`() async throws {
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/this-path-does-not-exist",
+                method: .get
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(body.contains(#"href="/css/error.css""#))
+                #expect(!body.contains("?v="))
+            }
+        }
+    }
+
+    @Test
+    func `serves the error page without revalidation headers`() async throws {
+        // A `304 Not Modified` only ever stands in for a success, so the error page must not
+        // invite revalidation with an entity tag or a cache policy.
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/this-path-does-not-exist",
+                method: .get
+            ) { response in
+                #expect(response.status == .notFound)
+                #expect(response.headers[.eTag] == nil)
+                #expect(response.headers[.cacheControl] == nil)
+            }
+        }
+    }
+
+    @Test
+    func `serves the full error page to a conditional request`() async throws {
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/this-path-does-not-exist",
+                method: .get,
+                headers: [.ifNoneMatch: "*"]
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(response.status == .notFound)
+                #expect(body.contains("Page Not Found"))
+            }
+        }
+    }
+
+}
+
+// MARK: - Helpers
+
+private extension NotFoundMiddlewareTests {
+
+    // MARK: Methods
+
+    /// Builds an application whose not-found middleware appends the given version token to the
+    /// error page's asset URLs.
+    /// - Parameter assetVersion: the version token appended to the page's asset URLs.
+    /// - Returns: the configured application.
+    func app(
+        assetVersion: String?
+    ) -> some ApplicationProtocol {
+        let router = Router(context: WebsiteRequestContext.self)
+
+        router.addMiddleware {
+            LocalizationMiddleware()
+            NotFoundMiddleware(
+                assetVersion: assetVersion
+            )
+        }
+
+        return Application(router: router)
+    }
+
 }