refactor: move DB to shared crate, convert push endpoints to server functions, remove dead REST handlers

shared/src/server_fns/push.rs

@@ -0,0 +1,22 @@
+use leptos::prelude::*;
+
+#[server(GetPushPublicKey, "/api/server_fns")]
+pub async fn get_public_key() -> Result<String, ServerFnError> {
+    let key = std::env::var("VAPID_PUBLIC_KEY")
+        .map_err(|_| ServerFnError::new("VAPID_PUBLIC_KEY not configured"))?;
+    Ok(key)
+}
+
+#[server(SubscribePush, "/api/server_fns")]
+pub async fn subscribe_push(
+    endpoint: String,
+    p256dh: String,
+    auth: String,
+) -> Result<(), ServerFnError> {
+    let db_ctx = expect_context::<crate::DbContext>();
+    db_ctx
+        .db
+        .save_push_subscription(&endpoint, &p256dh, &auth)
+        .await
+        .map_err(|e| ServerFnError::new(format!("Failed to save subscription: {}", e)))
+}