Migrate backend from PocketBase to Directus

Full cutover: auth, users, collection and friendships now run on Directus
via @directus/sdk, with owner/visibility rules enforced by Directus
permissions.

- middleware: Directus session (directus_auth cookie) with token refresh
- /login is Directus (email normalized to lowercase), new /register page
  (first/last name, username) backed by public registration
- collection, friends and profile pages + all API endpoints ported;
  ownership and addressee-only accept/decline enforced by permissions
- display names use first_name/last_name everywhere (nav, friends, profile)
- PocketBase SDK, POCKETBASE_URL and pb_schema.json removed
- README and compose updated for DIRECTUS_URL

src/lib/collection.ts

@@ -1,26 +1,14 @@
 /**
- * Shared helpers for the `mycards` PocketBase collection:
+ * Shared helpers for the `mycards` collection:
  * record typing and Cardmarket price resolution via the cached TCGdex client.
  */
 
 import { getCard } from "./tcgdex-cache";
+import type { MyCard } from "./directus";
 
-export interface MyCardRecord {
-    id: string;
-    user: string;
-    card_id: string;
-    card_name: string;
-    card_image: string;
-    variant: string;
-    quantity: number;
-    condition: string;
-    notes: string;
-    set_name: string;
-    created: string;
-    updated: string;
-}
+export type MyCardRecord = MyCard;
 
-export type PricedCard = MyCardRecord & { price: number; totalPrice: number };
+export type PricedCard = MyCard & { price: number; totalPrice: number };
 
 /** Collection variant label → Cardmarket avg price field. */
 export const variantPriceMap: Record<string, string> = {
@@ -37,7 +25,7 @@ export const variantPriceMap: Record<string, string> = {
  * repeated page loads don't hit the TCGdex API again.
  */
 export async function priceCollectionCards(
-    cards: MyCardRecord[],
+    cards: MyCard[],
 ): Promise<PricedCard[]> {
     return Promise.all(
         cards.map(async (card) => {
@@ -45,10 +33,11 @@ export async function priceCollectionCards(
             const detail = await getCard(card.card_id);
             const cardmarket = detail?.pricing?.cardmarket;
             if (cardmarket) {
-                const priceKey = variantPriceMap[card.variant] ?? "avg";
+                const priceKey = variantPriceMap[card.variant ?? ""] ?? "avg";
                 price = cardmarket[priceKey] ?? cardmarket.avg ?? 0;
             }
-            return { ...card, price, totalPrice: price * card.quantity };
+            const quantity = card.quantity ?? 1;
+            return { ...card, price, totalPrice: price * quantity };
         }),
     );
 }