feat: add saved views — database table, CRUD API, migration

- New views table (id, name, filters jsonb, sort_key, is_public, creator_id)
- GET/POST/PATCH/DELETE /views endpoints
- Register views router in server

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/lib/api.ts

@@ -3,6 +3,7 @@ import type {
   Queue,
   User,
   Transaction,
+  SavedView,
   Scrip,
   Template,
   TemplatePreview,
@@ -230,3 +231,31 @@ export async function updateCustomField(id: string, data: {
 }): Promise<{ data: CustomField | null; error: string | null }> {
   return request<CustomField>(`/custom-fields/${id}`, { method: "PATCH", body: JSON.stringify(data) });
 }
+
+export async function getViews(): Promise<{ data: SavedView[] | null; error: string | null }> {
+  return request<SavedView[]>("/views");
+}
+
+export async function createView(data: {
+  name: string;
+  filters: { field: string; operator: string; value: string }[];
+  sort_key?: string;
+  columns?: unknown[];
+  is_public?: boolean;
+}): Promise<{ data: SavedView | null; error: string | null }> {
+  return request<SavedView>("/views", { method: "POST", body: JSON.stringify(data) });
+}
+
+export async function updateView(id: string, data: {
+  name?: string;
+  filters?: { field: string; operator: string; value: string }[];
+  sort_key?: string;
+  columns?: unknown[];
+  is_public?: boolean;
+}): Promise<{ data: SavedView | null; error: string | null }> {
+  return request<SavedView>(`/views/${id}`, { method: "PATCH", body: JSON.stringify(data) });
+}
+
+export async function deleteView(id: string): Promise<{ data: { ok: boolean } | null; error: string | null }> {
+  return request<{ ok: boolean }>(`/views/${id}`, { method: "DELETE" });
+}