feat: kimlik doğrulama, ödeme, kredi ve AI rapor sihirbazı ekle

- better-auth ile giriş/oturum yönetimi (src/lib/auth, giris sayfası)
- iyzico ödeme entegrasyonu ve paket satın alma akışı
- kredi sistemi ve uygulama veritabanı şeması (drizzle)
- AI destekli rapor üretimi ve tercih sihirbazı
- rapor yazdırma sayfası ve site header/kullanıcı menüsü

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/appdb/schema.ts

@@ -0,0 +1,147 @@
+import {
+  sqliteTable,
+  text,
+  integer,
+  uniqueIndex,
+  index,
+} from "drizzle-orm/sqlite-core";
+
+// ---- better-auth çekirdek tabloları (+ kredi alanları) ----
+
+export const user = sqliteTable("user", {
+  id: text("id").primaryKey(),
+  name: text("name").notNull(),
+  email: text("email").notNull().unique(),
+  emailVerified: integer("email_verified", { mode: "boolean" })
+    .notNull()
+    .default(false),
+  image: text("image"),
+  creditBalance: integer("credit_balance").notNull().default(0),
+  hasPaket: integer("has_paket", { mode: "boolean" }).notNull().default(false),
+  createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" }).notNull(),
+});
+
+export const session = sqliteTable("session", {
+  id: text("id").primaryKey(),
+  expiresAt: integer("expires_at", { mode: "timestamp" }).notNull(),
+  token: text("token").notNull().unique(),
+  ipAddress: text("ip_address"),
+  userAgent: text("user_agent"),
+  userId: text("user_id")
+    .notNull()
+    .references(() => user.id, { onDelete: "cascade" }),
+  createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" }).notNull(),
+});
+
+export const account = sqliteTable("account", {
+  id: text("id").primaryKey(),
+  accountId: text("account_id").notNull(),
+  providerId: text("provider_id").notNull(),
+  userId: text("user_id")
+    .notNull()
+    .references(() => user.id, { onDelete: "cascade" }),
+  accessToken: text("access_token"),
+  refreshToken: text("refresh_token"),
+  idToken: text("id_token"),
+  accessTokenExpiresAt: integer("access_token_expires_at", {
+    mode: "timestamp",
+  }),
+  refreshTokenExpiresAt: integer("refresh_token_expires_at", {
+    mode: "timestamp",
+  }),
+  scope: text("scope"),
+  password: text("password"),
+  createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" }).notNull(),
+});
+
+export const verification = sqliteTable("verification", {
+  id: text("id").primaryKey(),
+  identifier: text("identifier").notNull(),
+  value: text("value").notNull(),
+  expiresAt: integer("expires_at", { mode: "timestamp" }).notNull(),
+  createdAt: integer("created_at", { mode: "timestamp" }),
+  updatedAt: integer("updated_at", { mode: "timestamp" }),
+});
+
+// ---- Ürün tabloları ----
+
+export const orders = sqliteTable(
+  "orders",
+  {
+    // cuid — iyzico conversationId olarak da kullanılır
+    id: text("id").primaryKey(),
+    userId: text("user_id")
+      .notNull()
+      .references(() => user.id),
+    product: text("product", { enum: ["paket", "topup"] }).notNull(),
+    amountKurus: integer("amount_kurus").notNull(),
+    credits: integer("credits").notNull(),
+    status: text("status", { enum: ["pending", "paid", "failed"] })
+      .notNull()
+      .default("pending"),
+    iyzicoToken: text("iyzico_token"),
+    iyzicoPaymentId: text("iyzico_payment_id"),
+    createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+    paidAt: integer("paid_at", { mode: "timestamp" }),
+  },
+  (t) => [index("orders_user").on(t.userId)],
+);
+
+export const creditLedger = sqliteTable(
+  "credit_ledger",
+  {
+    id: text("id").primaryKey(),
+    userId: text("user_id")
+      .notNull()
+      .references(() => user.id),
+    delta: integer("delta").notNull(),
+    reason: text("reason", {
+      enum: [
+        "trial_grant",
+        "purchase",
+        "topup",
+        "chat_message",
+        "refund",
+        "report_generate",
+        "report_revision",
+      ],
+    }).notNull(),
+    refId: text("ref_id"),
+    createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  },
+  (t) => [
+    uniqueIndex("ledger_reason_ref").on(t.reason, t.refId),
+    index("ledger_user").on(t.userId),
+  ],
+);
+
+export const chatMessages = sqliteTable(
+  "chat_messages",
+  {
+    id: text("id").primaryKey(),
+    userId: text("user_id")
+      .notNull()
+      .references(() => user.id),
+    role: text("role", { enum: ["user", "assistant"] }).notNull(),
+    content: text("content").notNull(),
+    clientMessageId: text("client_message_id").unique(),
+    createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  },
+  (t) => [index("chat_user_created").on(t.userId, t.createdAt)],
+);
+
+export const reports = sqliteTable("reports", {
+  id: text("id").primaryKey(),
+  userId: text("user_id")
+    .notNull()
+    .unique()
+    .references(() => user.id),
+  params: text("params", { mode: "json" }).notNull(),
+  result: text("result", { mode: "json" }),
+  revisionCount: integer("revision_count").notNull().default(0),
+  createdAt: integer("created_at", { mode: "timestamp" }).notNull(),
+  updatedAt: integer("updated_at", { mode: "timestamp" }).notNull(),
+});