feat: replace Directus with custom Node.js GraphQL backend

Removes Directus 11 and replaces it with a lean, purpose-built backend:
- packages/backend/: Fastify v5 + GraphQL Yoga v5 + Pothos (code-first)
  with Drizzle ORM, Redis sessions (session_token cookie), argon2 auth,
  Nodemailer, fluent-ffmpeg, and full gamification system ported from bundle
- Frontend: @directus/sdk replaced by graphql-request v7; services.ts fully
  rewritten with identical signatures; directus.ts now re-exports from api.ts
- Cookie renamed directus_session_token → session_token
- Dev proxy target updated 8055 → 4000
- compose.yml: Directus service removed, backend service added (port 4000)
- Dockerfile.backend: new multi-stage image with ffmpeg
- Dockerfile: bundle build step and ffmpeg removed from frontend image
- data-migration.ts: one-time script to migrate all Directus/sexy_ tables

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/db/schema/videos.ts

@@ -0,0 +1,90 @@
+import {
+  pgTable,
+  text,
+  timestamp,
+  boolean,
+  integer,
+  index,
+  uniqueIndex,
+  primaryKey,
+} from "drizzle-orm/pg-core";
+import { users } from "./users.js";
+import { files } from "./files.js";
+
+export const videos = pgTable(
+  "videos",
+  {
+    id: text("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
+    slug: text("slug").notNull(),
+    title: text("title").notNull(),
+    description: text("description"),
+    image: text("image").references(() => files.id, { onDelete: "set null" }),
+    movie: text("movie").references(() => files.id, { onDelete: "set null" }),
+    tags: text("tags").array().default([]),
+    upload_date: timestamp("upload_date").notNull().defaultNow(),
+    premium: boolean("premium").default(false),
+    featured: boolean("featured").default(false),
+    likes_count: integer("likes_count").default(0),
+    plays_count: integer("plays_count").default(0),
+  },
+  (t) => [
+    uniqueIndex("videos_slug_idx").on(t.slug),
+    index("videos_upload_date_idx").on(t.upload_date),
+    index("videos_featured_idx").on(t.featured),
+  ],
+);
+
+export const video_models = pgTable(
+  "video_models",
+  {
+    video_id: text("video_id")
+      .notNull()
+      .references(() => videos.id, { onDelete: "cascade" }),
+    user_id: text("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+  },
+  (t) => [primaryKey({ columns: [t.video_id, t.user_id] })],
+);
+
+export const video_likes = pgTable(
+  "video_likes",
+  {
+    id: text("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
+    video_id: text("video_id")
+      .notNull()
+      .references(() => videos.id, { onDelete: "cascade" }),
+    user_id: text("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    date_created: timestamp("date_created").notNull().defaultNow(),
+  },
+  (t) => [
+    index("video_likes_video_idx").on(t.video_id),
+    index("video_likes_user_idx").on(t.user_id),
+  ],
+);
+
+export const video_plays = pgTable(
+  "video_plays",
+  {
+    id: text("id").primaryKey().$defaultFn(() => crypto.randomUUID()),
+    video_id: text("video_id")
+      .notNull()
+      .references(() => videos.id, { onDelete: "cascade" }),
+    user_id: text("user_id").references(() => users.id, { onDelete: "set null" }),
+    session_id: text("session_id"),
+    duration_watched: integer("duration_watched"),
+    completed: boolean("completed").default(false),
+    date_created: timestamp("date_created").notNull().defaultNow(),
+    date_updated: timestamp("date_updated"),
+  },
+  (t) => [
+    index("video_plays_video_idx").on(t.video_id),
+    index("video_plays_user_idx").on(t.user_id),
+    index("video_plays_date_idx").on(t.date_created),
+  ],
+);
+
+export type Video = typeof videos.$inferSelect;
+export type NewVideo = typeof videos.$inferInsert;