sync README: update arch diagram and structure for stats separation

README.md

@@ -19,14 +19,16 @@ PriceStore ─────────┼─────────────
                     └──────────────┘
                            │
                  ┌─────────▼─────────┐
-                 │ ScanBGHL (500ms)   │
+                 │ ScanBGHL (200ms)   │
                  │ BG ↔ HL only       │
                  └─────────┬─────────┘
                            │
            ┌───────────────▼────────────────┐
-           │  Trader: TryEntry / Tick / Exit │
+           │   Trader (trading logic only)   │
+           │  TryEntry / Tick / Exit        │
            │  Maker fees, scale-in, stop    │
            │  Synchronous entry (no goroutine)│
+           │  NO display/stat calculations  │
            └───────────────┬────────────────┘
                            │
                  ┌─────────▼─────────┐
@@ -34,10 +36,14 @@ PriceStore ─────────┼─────────────
                  │ (opportunity life) │
                  └─────────┬─────────┘
                            │
-                 ┌─────────▼─────────┐
-                 │   Notifier: TG     │
-                 │   Dashboard: :8888 │
-                 └───────────────────┘
+        ┌──────────────────┼──────────────────┐
+        │                  │                  │
+  ┌─────▼─────┐   ┌────────▼───────┐   ┌─────▼─────┐
+  │ Notifier  │   │ Dashboard      │   │ DB        │
+  │ TG        │   │ :8888          │   │ SQLite    │
+  │           │   │ Stats calc     │   │ trades.db │
+  │           │   │ (calcDetailed) │   │           │
+  └───────────┘   └────────────────┘   └───────────┘
 ```
 
 ## Tracked Coins
@@ -173,11 +179,11 @@ Built-in HTTP server at `:8888` with real-time SSE push (1-second refresh):
 ```
 exchange-monitor-go/
 ├── main.go                   # Entry point, WS startup, main loop
-├── config.go                 # .env configuration loader
+├── config.go                 # .env + config.json hierarchical config
 ├── types.go                  # PriceStore, TrackedCoin, ArbOpportunity
 ├── scanner.go                # ScanBGHL — arbitrage scanner
-├── trader.go                 # Position management, entry/exit/scale-in
-├── dashboard.go              # Web server + SSE + history buffers
+├── trader.go                 # Position management, entry/exit/scale-in (pure trading logic)
+├── dashboard.go              # Web server + SSE + stats calc (display layer)
 ├── toaster.go                # Telegram notifications
 ├── static.go                 # Embedded web static files
 ├── start.sh                  # Startup script (port check + build + run)