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/Controllers/RootControllerTests.swift

@@ -1,5 +1,6 @@
 import Hummingbird
 import HummingbirdTesting
+import Infrastructure
 import NIOCore
 import Testing
 
@@ -42,4 +43,117 @@ struct RootControllerTests {
         }
     }
 
+    @Test
+    func `serves the landing page with revalidation headers`() async throws {
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/",
+                method: .get
+            ) { response in
+                let eTag = try #require(response.headers[.eTag])
+
+                #expect(eTag.hasPrefix(#"W/""#))
+                #expect(response.headers[.cacheControl] == "public, no-cache")
+            }
+        }
+    }
+
+    @Test
+    func `revalidates a matching conditional request with a 304`() async throws {
+        try await app.test(.router) { client in
+            let eTag = try await client.execute(
+                uri: "/",
+                method: .get
+            ) { response in
+                try #require(response.headers[.eTag])
+            }
+
+            try await client.execute(
+                uri: "/",
+                method: .get,
+                headers: [.ifNoneMatch: eTag]
+            ) { response in
+                #expect(response.status == .notModified)
+                #expect(response.headers[.eTag] == eTag)
+                #expect(response.body.readableBytes == 0)
+            }
+        }
+    }
+
+    @Test
+    func `serves the full page to a non-matching conditional request`() async throws {
+        try await app.test(.router) { client in
+            try await client.execute(
+                uri: "/",
+                method: .get,
+                headers: [.ifNoneMatch: #"W/"0123456789abcdef""#]
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(response.status == .ok)
+                #expect(body.contains("Hello world!"))
+            }
+        }
+    }
+
+    @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: "/",
+                method: .get
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(body.contains("/css/index.css?v=0123456789abcdef"))
+                #expect(body.contains("/js/index.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: "/",
+                method: .get
+            ) { response in
+                let body = String(buffer: response.body)
+
+                #expect(body.contains(#"href="/css/index.css""#))
+                #expect(!body.contains("?v="))
+            }
+        }
+    }
+
+}
+
+// MARK: - Helpers
+
+private extension RootControllerTests {
+
+    // MARK: Methods
+
+    /// Builds an application whose root controller appends the given version token to the landing
+    /// 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()
+        }
+
+        router.addRoutes(RootController<WebsiteRequestContext>(
+            assetVersion: assetVersion
+        ).routes)
+
+        return Application(router: router)
+    }
+
 }