fix: gate helper imports with #[cfg(feature = "server")] in posts API

Server-only helper functions (get_current_admin_user, row_to_post_list,
row_to_post_full, sync_tags, clean_tags) are defined behind
#[cfg(feature = "server")] in helpers.rs, but their imports in consumer
files were not gated, causing WASM build failures.

src/api/posts/create.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::{clean_tags, get_current_admin_user, sync_tags};
 use super::types::CreatePostResponse;
 #[cfg(feature = "server")]

src/api/posts/delete.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::get_current_admin_user;
 use super::types::CreatePostResponse;
 #[cfg(feature = "server")]

src/api/posts/list.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::{get_current_admin_user, row_to_post_list};
 use super::types::PostListResponse;
 #[cfg(feature = "server")]

src/api/posts/read.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::{get_current_admin_user, row_to_post_full, row_to_post_list};
 use super::types::SinglePostResponse;
 #[cfg(feature = "server")]

src/api/posts/search.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::row_to_post_list;
 use super::types::PostListResponse;
 #[cfg(feature = "server")]

src/api/posts/stats.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::get_current_admin_user;
 use super::types::PostStatsResponse;
 #[cfg(feature = "server")]

src/api/posts/update.rs

@@ -1,5 +1,6 @@
 use dioxus::prelude::*;
 
+#[cfg(feature = "server")]
 use super::helpers::{clean_tags, get_current_admin_user, sync_tags};
 use super::types::CreatePostResponse;
 #[cfg(feature = "server")]