Few small fixes for the Website service (#23)

This PR contains the work done to address small fixes.

To provide further details:

* HTML template
  * Removed the duplicate charset <meta> tag from the Page protocol's head property.

* Router
  * Enabled auto-generated HEAD endpoints so every GET route gets a HEAD sibling. Uptime monitors and crawlers probing with HEAD now receive the page's status and headers instead of a 404.

* Docker
  * Pinned the asset optimizer versionsvia build args so minified output is reproducible for a given Dockerfile commit.
  * Narrowed the build context copied into the release stage, only package manifests and Swift sources are copied. Static assets come from the separate assets stage after the binary is built.
  * svgo now minifies all SVGs recursively rather than just icon.svg, and the staging step creates Resources/Static explicitly instead of conditionally moving the unminified sources.
  * Added curl to the runtime image (needed for the container healthcheck) and .claude to .dockerignore.

* Docker-compose
  * Added a `healthcheck` to the website service hitting GET /health (liveness only), so Compose reports process health without coupling container health to database reachability.

Reviewed-on: rock-n-code/loud-amsterdam#23
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Services/Website/Sources/App/Extensions/App+Build.swift

@@ -140,7 +140,12 @@ private func router(
     logLevel: Logger.Level,
     probe: Probe
 ) -> Router<AppRequestContext> {
-    let router = Router(context: AppRequestContext.self)
+    // HEAD siblings are generated for every GET route, so uptime monitors and crawlers probing
+    // with HEAD requests get the page's status and headers instead of a 404.
+    let router = Router(
+        context: AppRequestContext.self,
+        options: .autoGenerateHeadEndpoints
+    )
 
     router.addMiddleware {
         LogRequestsMiddleware(logLevel)

Services/Website/Sources/Library/Internal/Protocols/Page.swift

@@ -47,9 +47,11 @@ extension Page {
     }
 
     /// The metadata, ``stylesheets``, icon, and manifest links placed in the document head.
+    ///
+    /// The charset declaration is omitted: Elementary's `HTMLDocument` scaffolding already
+    /// emits `<meta charset="UTF-8">` before this markup, and HTML5 allows only one.
     @HTMLBuilder
     var head: some HTML {
-        meta(.charset(.utf8))
         meta(
             .name(.viewport),
             .content("width=device-width, initial-scale=1")