refactor(api): remove 5 deprecated list endpoints superseded by /resources

The normalized cursor-paginated /resources API is live and the bundled
frontend already uses it for favorites, recent, trash and grants. These five
deprecated old-format endpoints had no remaining frontend or protocol
consumers (the Nextcloud handlers call the service layer directly, not these
HTTP routes), so remove them for a uniform API and less duplicate listing
logic:

- GET /api/folders/{id}/contents          → use /api/folders/{id}/resources
- GET /api/folders/{id}/contents/paginated → use /api/folders/{id}/resources
- GET /api/favorites                       → use /api/favorites/resources
- GET /api/recent                          → use /api/recent/resources
- GET /api/trash                           → use /api/trash/resources

Removes the HTTP handlers, their routes, OpenAPI path registrations, and the
now-dead list_folder_contents{,_paginated}_impl helpers + unused imports. The
underlying service methods (favorites_service.get_favorites,
trash_service.get_trash_items, etc.) are KEPT — the Nextcloud OCS/trashbin
handlers depend on them.

Deliberately NOT removed: GET /api/folders/{id}/listing. It is still the Files
view's primary data path and offers ETag/304 conditional caching plus
one-shot favorite/share badge sets that /resources does not yet provide;
migrating it needs a separate parity pass on /resources first.

Updates the OpenAPI structure test and the two docs that referenced the
removed paths. `cargo clippy -D warnings` clean; 443 lib tests pass; OpenAPI
regenerates with the 5 paths gone and the /resources replacements present.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/interfaces/api/handlers/recent_handler.rs

@@ -4,9 +4,8 @@ use axum::{
     http::StatusCode,
     response::IntoResponse,
 };
-use serde::Deserialize;
 use std::sync::Arc;
-use tracing::{error, info, warn};
+use tracing::{error, info};
 
 use crate::application::dtos::display_helpers::{
     category_for, format_file_size, icon_class_for, icon_special_class_for,
@@ -24,50 +23,6 @@ use crate::interfaces::errors::AppError;
 use crate::interfaces::middleware::auth::AuthUser;
 use uuid::Uuid;
 
-/// Query parameters for getting recent items
-#[derive(Deserialize)]
-pub struct GetRecentParams {
-    #[serde(default)]
-    limit: Option<i32>,
-}
-
-/// Get user's recent items (deprecated — use `GET /api/recent/resources` instead)
-#[deprecated = "Use GET /api/recent/resources instead"]
-#[utoipa::path(
-    get,
-    path = "/api/recent",
-    responses(
-        (status = 200, description = "List of recent items", body = Vec<crate::application::dtos::recent_dto::RecentItemDto>)
-    ),
-    security(("bearerAuth" = [])),
-    tag = "recent"
-)]
-pub async fn get_recent_items(
-    State(recent_service): State<Arc<RecentService>>,
-    auth_user: AuthUser,
-    Query(params): Query<GetRecentParams>,
-) -> impl IntoResponse {
-    let user_id = auth_user.id;
-    warn!("Deprecated endpoint called: GET /api/recent — use GET /api/recent/resources instead");
-
-    match recent_service.get_recent_items(user_id, params.limit).await {
-        Ok(items) => {
-            info!("Retrieved {} recent items for user", items.len());
-            (StatusCode::OK, Json(items)).into_response()
-        }
-        Err(err) => {
-            error!("Error retrieving recent items: {}", err);
-            (
-                StatusCode::INTERNAL_SERVER_ERROR,
-                Json(serde_json::json!({
-                    "error": "Failed to retrieve recent items"
-                })),
-            )
-                .into_response()
-        }
-    }
-}
-
 /// Record access to an item
 #[utoipa::path(
     post,