React + FastAPI 풀 마이그레이션 — Streamlit 제거

- backend/ — FastAPI + JWT + 모든 REST 엔드포인트
- frontend/ — Next.js 14 + Tailwind + 7페이지 (대시보드/트레이드/거래소/자동매매/설정/내정보/로그인)
- core_logic.py — 신호계산/알림 로직 분리 (기존 app_streamlit.py 에서 추출)
- users_db.py + bcrypt 인증, exchange_keys.py + Fernet 암호화
- trades_db.py — 진입/청산 lifecycle 추적, signal_events raw 로그
- settings_db.py — 모든 운영 파라미터 DB 영속 저장 (RSI/거래량/펀딩비 임계값 포함)
- docker-compose: frontend / backend / postgres + Traefik 라우팅
- assets/logo.svg — JUNGGOMOA 그라디언트 로고

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/lib/api.ts

@@ -0,0 +1,41 @@
+// 클라이언트 API wrapper. JWT 는 localStorage 에 보관.
+const TOKEN_KEY = 'jm_token';
+
+export function getToken(): string | null {
+  if (typeof window === 'undefined') return null;
+  return localStorage.getItem(TOKEN_KEY);
+}
+export function setToken(t: string) { localStorage.setItem(TOKEN_KEY, t); }
+export function clearToken() { localStorage.removeItem(TOKEN_KEY); }
+
+async function request<T = any>(path: string, opts: RequestInit = {}): Promise<T> {
+  const token = getToken();
+  const headers: Record<string, string> = {
+    'Content-Type': 'application/json',
+    ...(opts.headers as any),
+  };
+  if (token) headers['Authorization'] = `Bearer ${token}`;
+  const res = await fetch(path, { ...opts, headers });
+  if (res.status === 401) {
+    clearToken();
+    if (typeof window !== 'undefined' && window.location.pathname !== '/login') {
+      window.location.href = '/login';
+    }
+    throw new Error('unauthorized');
+  }
+  if (!res.ok) {
+    const text = await res.text();
+    let msg = text;
+    try { msg = JSON.parse(text).detail || text; } catch {}
+    throw new Error(msg || `${res.status}`);
+  }
+  if (res.status === 204) return undefined as any;
+  return res.json();
+}
+
+export const api = {
+  get:    <T = any>(p: string)            => request<T>(p),
+  post:   <T = any>(p: string, body: any) => request<T>(p, { method: 'POST', body: JSON.stringify(body) }),
+  put:    <T = any>(p: string, body: any) => request<T>(p, { method: 'PUT',  body: JSON.stringify(body) }),
+  delete: <T = any>(p: string)            => request<T>(p, { method: 'DELETE' }),
+};

frontend/lib/auth.ts

@@ -0,0 +1,47 @@
+'use client';
+import { create } from 'zustand';
+import { api, getToken, setToken, clearToken } from './api';
+
+interface AuthUser { id?: number; username: string; role: string; created_at?: string; last_login_at?: string; }
+
+interface AuthState {
+  user: AuthUser | null;
+  loading: boolean;
+  error: string | null;
+  login: (u: string, p: string) => Promise<boolean>;
+  logout: () => void;
+  fetchMe: () => Promise<void>;
+}
+
+export const useAuth = create<AuthState>((set) => ({
+  user: null,
+  loading: false,
+  error: null,
+  async login(u, p) {
+    set({ loading: true, error: null });
+    try {
+      const r = await api.post<{ access_token: string; user: AuthUser }>('/api/auth/login', { username: u, password: p });
+      setToken(r.access_token);
+      set({ user: r.user, loading: false });
+      return true;
+    } catch (e: any) {
+      set({ error: e?.message || '로그인 실패', loading: false });
+      return false;
+    }
+  },
+  logout() {
+    clearToken();
+    set({ user: null });
+    if (typeof window !== 'undefined') window.location.href = '/login';
+  },
+  async fetchMe() {
+    if (!getToken()) { set({ user: null }); return; }
+    try {
+      const me = await api.get<AuthUser>('/api/auth/me');
+      set({ user: me });
+    } catch {
+      clearToken();
+      set({ user: null });
+    }
+  },
+}));

frontend/lib/cn.ts

@@ -0,0 +1,3 @@
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+export function cn(...inputs: ClassValue[]) { return twMerge(clsx(inputs)); }