feat: stages module, mobility frontend, theme toggle, employeeOnly access control

- Add stages module with full CRUD API and admin overview island
- Add mobility overview island (Liste, Kanban, Detail CRUD views)
- Add contract PDF upload/download endpoints for mobilites
- Add light/dark theme toggle in header
- Add employeeOnly flag to hide entire modules from students (admin, students, stages)
- Add read-only GET endpoints for modules/ues/ue-modules in notes module
- Add [slug].tsx catch-all routes for direct URL navigation
- Replace old mobility table with mobilites + stages schema (migration 0004)
- Allow students to create mobilites and upload contracts
- Redirect authenticated users from / to /apps catalog

databases/schema.ts

@@ -1,7 +1,7 @@
 import {
-  date,
   doublePrecision,
   integer,
+  pgEnum,
   pgTable,
   primaryKey,
   serial,
@@ -89,13 +89,29 @@ export const ajustements = pgTable("ajustements", {
   pk: primaryKey({ columns: [t.numEtud, t.idUE] }),
 }));
 
-export const mobility = pgTable("mobility", {
-  id: serial("id").primaryKey(),
-  studentId: integer("studentId").references(() => students.numEtud),
-  startDate: date("startDate"),
-  endDate: date("endDate"),
-  weeksCount: integer("weeksCount"),
-  destinationCountry: text("destinationCountry"),
-  destinationName: text("destinationName"),
-  mobilityStatus: text("mobilityStatus").default("N/A"),
+export const stages = pgTable("stages", {
+  id: serial("idStage").primaryKey(),
+  numEtud: integer("numEtud").notNull().references(() => students.numEtud),
+  duree: integer("duree").notNull(),
+  nomEntreprise: text("nomEntreprise").notNull(),
+  mission: text("mission"),
+});
+
+export const mobilityStatusEnum = pgEnum("mobility_status", [
+  "contracts_received",
+  "under_revision",
+  "done",
+  "validated",
+  "canceled",
+]);
+
+export const mobilites = pgTable("mobilites", {
+  id: serial("idMob").primaryKey(),
+  numEtud: integer("numEtud").notNull().references(() => students.numEtud),
+  duree: integer("duree").notNull(),
+  contratMob: text("contratMob"),
+  ecole: text("ecole"),
+  pays: text("pays"),
+  status: mobilityStatusEnum("status").notNull().default("contracts_received"),
+  idStage: integer("idStage").references(() => stages.id),
 });