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/README.md

@@ -0,0 +1,34 @@
+# Infrastructure
+The shared [Hummingbird](https://github.com/hummingbird-project/hummingbird) toolkit the **Loud** services build on: declarative routing, hardened HTTP middlewares, pre-rendered localized HTML responses, and the page and asset scaffolding.
+
+## Overview
+The package provides, grouped by role:
+
+| Role | Types |
+| --- | --- |
+| Routing | `RouterController`, `RouteCollectionBuilder`, the `addController` extension on `RouterMethods` |
+| Middlewares | `SecurityHeadersMiddleware`, `VaryMiddleware`, `RateLimitMiddleware`, `LocalizationMiddleware`, `NotFoundMiddleware` |
+| Pages and assets | `Page`, `Asset`, `AssetExtension`, `FingerprintAssets` |
+| Responses | `CachedHTMLResponse`, `LocalizedHTMLCollectionResponse` |
+| Contexts | `LocalizedRequestContext` |
+
+## Design rules
+The package holds only what every service can reuse; anything a service owns is injected, never referenced:
+
+- **No site-specific content.** No page markup, no asset catalog, no `Bundle.module` lookups. A type that needs a service's content takes it as a parameter: the `bundle:` whose String Catalog names the supported languages (`LocalizationMiddleware`, `LocalizedHTMLCollectionResponse`, `NotFoundMiddleware`), the `document:` closure that builds a page for a locale, and the `metadata` requirement through which a `Page` conformer supplies its icon links and theme colors.
+- **Services fill the gaps once, via extensions.** A service restores its convenient call sites with retroactive extensions — the Website's `Page+Defaults`, `LocalizationMiddleware+Defaults`, and `NotFoundMiddleware+Defaults` are the pattern to follow.
+- **Method structs.** Single-operation types such as `FingerprintAssets` hold their lifetime-fixed configuration in `init` and take only per-call inputs in `callAsFunction`.
+
+## Layout
+Sources are split by visibility, then by kind, one type per file:
+
+```
+Sources/Public/<Kind>/     public API (Protocols, Middlewares, Responses, …)
+Sources/Internal/<Kind>/   implementation details (e.g. FNV1aHash)
+Tests/Cases/…              mirrors the source layout
+Tests/Utils/…              stubs and test-only extensions
+```
+
+## Requirements
+- Swift 6.3 toolchain (`swift-tools-version:6.3`).
+- macOS 15, matching the sibling `Localization` and `Persistence` packages (the services deploy to Linux containers; the packages carry no UI platforms).