wiki: add Wiring Up page

Wiring-Up.md

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+# Wiring Up
+
+`ActivityPubService` is the central struct. Build it once at startup, share it via `Arc`.
+
+---
+
+## Build the service
+
+```rust
+use std::sync::Arc;
+use k_ap::ActivityPubService;
+
+let db = Arc::new(MyDb::new(pool));
+
+let service = ActivityPubService::builder("https://example.com")
+    .activity_repo(db.clone())
+    .follow_repo(db.clone())
+    .actor_repo(db.clone())
+    .blocklist_repo(db.clone())
+    .user_repo(db.clone())
+    .content_reader(db.clone())
+    .object_handler(db.clone())
+    .allow_registration(false)
+    .software_name("my-app")
+    .build()
+    .await?;
+```
+
+The base URL (`"https://example.com"`) is used for all AP URLs the library generates — actor IDs, inbox URLs, collections. It must match the public URL of your service.
+
+All seven setters are required. Calling `.build()` before any of them panics with a descriptive message.
+
+---
+
+## Mount on axum
+
+```rust
+use axum::Router;
+
+let router = Router::new()
+    .merge(service.router())               // AP routes owned by k-ap
+    .route("/users/:id", get(actor_handler)) // your routes
+    // ... rest of your routes
+    .with_state(app_state);
+```
+
+`service.router()` registers 7 routes. See [Routes Reference](Routes-Reference) for the full list and the content negotiation pattern for actor/followers/following.
+
+---
+
+## Optional builder settings
+
+| Method | Default | Description |
+|--------|---------|-------------|
+| `.allow_registration(bool)` | `false` | Reported in NodeInfo `openRegistrations` |
+| `.software_name(&str)` | `""` | Reported in NodeInfo `software.name` |
+| `.delivery_max_attempts(u32)` | `3` | Max retry attempts per delivery |
+| `.delivery_initial_delay_secs(u64)` | `1` | Initial backoff before first retry (doubles each attempt) |
+| `.event_publisher(Arc<dyn EventPublisher>)` | in-process spawn | Route delivery/backfill through a job queue |
+| `.debug(bool)` | `false` | Enable debug mode in activitypub_federation |
+
+---
+
+## Real-world examples
+
+Both implement all seven traits on a single `Arc<Db>` struct:
+
+- [`thoughts`](https://git.gabrielkaszewski.dev/GKaszewski/thoughts) — microblogging; one of the sources k-ap was extracted from
+- [`movies-diary`](https://git.gabrielkaszewski.dev/GKaszewski/movies-diary) — movie logging; the other source