feat: add subjects and tasks API, hooks, and related types

- Implemented subjects API with functions for creating, updating, and retrieving subjects, including history and bibliography.
- Added tasks API for managing user tasks, including listing and marking tasks as completed.
- Created hooks for managing AI interactions, authentication, subjects, tasks, and metadata queries.
- Established query keys for caching and managing query states.
- Introduced Supabase client and environment variable management for better configuration.
- Defined types for database and domain models to ensure type safety across the application.

src/data/hooks/useTasks.ts

@@ -0,0 +1,22 @@
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { qk } from "../query/keys";
+import { tareas_marcar_completada, tareas_mias_list } from "../api/tasks.api";
+
+export function useMisTareas() {
+  return useQuery({
+    queryKey: qk.tareas(),
+    queryFn: tareas_mias_list,
+    staleTime: 15_000,
+  });
+}
+
+export function useMarcarTareaCompletada() {
+  const qc = useQueryClient();
+
+  return useMutation({
+    mutationFn: tareas_marcar_completada,
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: qk.tareas() });
+    },
+  });
+}