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/Internal/Types/FNV1aHash.swift

@@ -0,0 +1,47 @@
+import Foundation
+
+/// Hashes bytes with the FNV-1a 64-bit algorithm.
+///
+/// The hash is stable across processes and platforms, which `Hasher` deliberately is not, so it
+/// suits values that must agree between instances and survive restarts: the asset version token
+/// (``FingerprintAssets``) and the entity tags of the pre-rendered pages (`CachedHTMLResponse`).
+/// It is not cryptographic — a collision only risks serving a stale cached asset, not security.
+struct FNV1aHash {
+
+    // MARK: Properties
+
+    /// The running hash value.
+    private var hash: UInt64
+
+    // MARK: Initializers
+
+    /// Creates a hasher at the FNV-1a offset basis.
+    init() {
+        self.hash = 0xcbf2_9ce4_8422_2325
+    }
+
+    // MARK: Computed
+
+    /// The hash of everything combined so far, as a fixed-width, 16-character hexadecimal token.
+    ///
+    /// Reading it does not consume the running hash: more bytes can be combined afterwards.
+    var digest: String {
+        String(
+            format: "%016llx",
+            hash
+        )
+    }
+
+    // MARK: Functions
+
+    /// Folds the given bytes into the hash.
+    /// - Parameter bytes: the bytes to fold in.
+    mutating func combine(
+        _ bytes: some Sequence<UInt8>
+    ) {
+        for byte in bytes {
+            hash = (hash ^ UInt64(byte)) &* 0x100_0000_01b3
+        }
+    }
+
+}