refactor: simplify API routes and add sniffer status functionality

- Updated API routes to remove redundant prefixes.
- Introduced sniffer status fetching in the backend API.
- Added Sniffing page and integrated it into the routing.
- Created a new hook for backend API interactions.
- Implemented sniffer status type definitions.

frontend/src/types/sniffer.ts

@@ -0,0 +1,21 @@
+/**
+ * Status of an individual interface monitored by the AF_PACKET sniffer.
+ */
+export interface InterfaceSnifferStatus {
+  /** Whether the sniffer thread is active */
+  running: boolean;
+
+  /** Whether the interface exists in /sys/class/net */
+  exists: boolean;
+
+  /** Whether the interface is operationally UP */
+  up: boolean;
+}
+
+/**
+ * Response model for the sniffer status endpoint.
+ * Maps interface names to their sniffer status.
+ */
+export interface SnifferStatusResponse {
+  interfaces: Record<string, InterfaceSnifferStatus>;
+}