Initial commit: EGBE chatbot template

Stripped from vercel/chatbot (Apache 2.0):
- Dropped @vercel/* packages and AI Gateway
- Removed artifacts feature (code/text/sheet/image side panel)
- Switched AI provider to @ai-sdk/openai-compatible -> EGBE LiteLLM
- Replaced Vercel Blob upload with data URLs
- Dropped Redis resumable streams and rate limiter (in-memory now)
- Added Dockerfile (Next.js standalone) + entrypoint that runs migrations
- Wired DATABASE_URL, EGBE_AI_API_URL/KEY, NEXT_PUBLIC_BASE_URL for app-deploy.sh

lib/db/schema.ts

@@ -0,0 +1,70 @@
+import type { InferSelectModel } from "drizzle-orm";
+import {
+  boolean,
+  json,
+  pgTable,
+  primaryKey,
+  text,
+  timestamp,
+  uuid,
+  varchar,
+} from "drizzle-orm/pg-core";
+
+export const user = pgTable("User", {
+  id: uuid("id").primaryKey().notNull().defaultRandom(),
+  email: varchar("email", { length: 64 }).notNull(),
+  password: varchar("password", { length: 64 }),
+  name: text("name"),
+  emailVerified: boolean("emailVerified").notNull().default(false),
+  image: text("image"),
+  isAnonymous: boolean("isAnonymous").notNull().default(false),
+  createdAt: timestamp("createdAt").notNull().defaultNow(),
+  updatedAt: timestamp("updatedAt").notNull().defaultNow(),
+});
+
+export type User = InferSelectModel<typeof user>;
+
+export const chat = pgTable("Chat", {
+  id: uuid("id").primaryKey().notNull().defaultRandom(),
+  createdAt: timestamp("createdAt").notNull(),
+  title: text("title").notNull(),
+  userId: uuid("userId")
+    .notNull()
+    .references(() => user.id),
+  visibility: varchar("visibility", { enum: ["public", "private"] })
+    .notNull()
+    .default("private"),
+});
+
+export type Chat = InferSelectModel<typeof chat>;
+
+export const message = pgTable("Message_v2", {
+  id: uuid("id").primaryKey().notNull().defaultRandom(),
+  chatId: uuid("chatId")
+    .notNull()
+    .references(() => chat.id),
+  role: varchar("role").notNull(),
+  parts: json("parts").notNull(),
+  attachments: json("attachments").notNull(),
+  createdAt: timestamp("createdAt").notNull(),
+});
+
+export type DBMessage = InferSelectModel<typeof message>;
+
+export const vote = pgTable(
+  "Vote_v2",
+  {
+    chatId: uuid("chatId")
+      .notNull()
+      .references(() => chat.id),
+    messageId: uuid("messageId")
+      .notNull()
+      .references(() => message.id),
+    isUpvoted: boolean("isUpvoted").notNull(),
+  },
+  (table) => ({
+    pk: primaryKey({ columns: [table.chatId, table.messageId] }),
+  })
+);
+
+export type Vote = InferSelectModel<typeof vote>;