added tanstack query keys and hooks

packages/frontend/src/lib/query/keys.ts

@@ -0,0 +1,33 @@
+// query key factory for granular cache invalidation
+
+export const queryKeys = {
+    organisations: {
+        all: ["organisations"] as const,
+        byUser: () => [...queryKeys.organisations.all, "by-user"] as const,
+        members: (orgId: number) => [...queryKeys.organisations.all, orgId, "members"] as const,
+    },
+    projects: {
+        all: ["projects"] as const,
+        byOrganisation: (orgId: number) => [...queryKeys.projects.all, "by-org", orgId] as const,
+    },
+    issues: {
+        all: ["issues"] as const,
+        byProject: (projectId: number) => [...queryKeys.issues.all, "by-project", projectId] as const,
+        statusCount: (organisationId: number, status: string) =>
+            [...queryKeys.issues.all, "status-count", organisationId, status] as const,
+    },
+    sprints: {
+        all: ["sprints"] as const,
+        byProject: (projectId: number) => [...queryKeys.sprints.all, "by-project", projectId] as const,
+    },
+    timers: {
+        all: ["timers"] as const,
+        active: (issueId: number) => [...queryKeys.timers.all, "active", issueId] as const,
+        inactive: (issueId: number) => [...queryKeys.timers.all, "inactive", issueId] as const,
+        list: (issueId: number) => [...queryKeys.timers.all, "list", issueId] as const,
+    },
+    users: {
+        all: ["users"] as const,
+        byUsername: (username: string) => [...queryKeys.users.all, "by-username", username] as const,
+    },
+};