feat(blog): add file-based blog with dynamic slugs, MDX content and layout shell

- Introduced blog routing using Next.js App Router
- Implemented dynamic [slug] pages for blog posts
- Added MDX-based content loading via lib/posts
- Integrated shared TopBar layout with navigation
- Established clear content, lib and component separation

apps/public-web/node_modules/next/dist/server/app-render/cache-signal.d.ts

@@ -0,0 +1,34 @@
+/**
+ * This class is used to detect when all cache reads for a given render are settled.
+ * We do this to allow for cache warming the prerender without having to continue rendering
+ * the remainder of the page. This feature is really only useful when the cacheComponents flag is on
+ * and should only be used in codepaths gated with this feature.
+ */
+export declare class CacheSignal {
+    private count;
+    private earlyListeners;
+    private listeners;
+    private tickPending;
+    private pendingTimeoutCleanup;
+    private subscribedSignals;
+    constructor();
+    private noMorePendingCaches;
+    private invokeListenersIfNoPendingReads;
+    /**
+     * This promise waits until there are no more in progress cache reads but no later.
+     * This allows for adding more cache reads after to delay cacheReady.
+     */
+    inputReady(): Promise<void>;
+    /**
+     * If there are inflight cache reads this Promise can resolve in a microtask however
+     * if there are no inflight cache reads then we wait at least one task to allow initial
+     * cache reads to be initiated.
+     */
+    cacheReady(): Promise<void>;
+    beginRead(): void;
+    endRead(): void;
+    hasPendingReads(): boolean;
+    trackRead<T>(promise: Promise<T>): Promise<T>;
+    subscribeToReads(subscriber: CacheSignal): () => void;
+    unsubscribeFromReads(subscriber: CacheSignal): void;
+}