CHORE(merge): merge from develop

- Initial setup and all features from develop branch
- Includes: auth, deploy, docker, style fixes
- K3S deployment configuration

nextjs/lib/auth.ts

@@ -0,0 +1,73 @@
+import NextAuth from "next-auth";
+import Credentials from "next-auth/providers/credentials";
+import { compare } from "bcryptjs";
+import { prisma } from "@/lib/prisma";
+
+export const { handlers, signIn, signOut, auth } = NextAuth({
+  trustHost: true,
+  secret: process.env.AUTH_SECRET || process.env.JWT_SECRET,
+  providers: [
+    Credentials({
+      name: "Credentials",
+      credentials: {
+        userId: { label: "아이디", type: "text" },
+        userPassword: { label: "비밀번호", type: "password" },
+      },
+      async authorize(credentials) {
+        if (!credentials?.userId || !credentials?.userPassword) {
+          return null;
+        }
+
+        const user = await prisma.user.findUnique({
+          where: { userId: credentials.userId as string },
+        });
+
+        if (!user) {
+          return null;
+        }
+
+        const isPasswordCorrect = await compare(
+          credentials.userPassword as string,
+          user.userPassword
+        );
+
+        if (!isPasswordCorrect) {
+          return null;
+        }
+
+        return {
+          id: user.id.toString(),
+          userId: user.userId,
+          name: user.userName,
+          email: user.userPhone,
+        };
+      },
+    }),
+  ],
+  session: {
+    strategy: "jwt",
+    maxAge: 3 * 24 * 60 * 60, // 3일
+  },
+  callbacks: {
+    async jwt({ token, user }) {
+      if (user) {
+        token.id = user.id;
+        token.userId = user.userId;
+        token.name = user.name;
+      }
+      return token;
+    },
+    async session({ session, token }) {
+      if (token && session.user) {
+        session.user.id = token.id as string;
+        session.user.userId = token.userId as string;
+        session.user.name = token.name as string;
+      }
+      return session;
+    },
+  },
+  pages: {
+    signIn: "/login",
+  },
+});
+