Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

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

docs/BROWSER_CACHE_FIX.md

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+# Browser Cache Issue - Fix Instructions
+
+## Problem
+The browser is using cached JavaScript, causing:
+- Old error messages
+- HTTP 400 errors that don't match the actual API response
+- Line numbers that don't match the current code
+
+## Solution
+
+### Method 1: Hard Refresh (Recommended)
+1. **Chrome/Edge (Windows/Linux)**: Press `Ctrl + Shift + R` or `Ctrl + F5`
+2. **Chrome/Edge (Mac)**: Press `Cmd + Shift + R`
+3. **Firefox**: Press `Ctrl + Shift + R` (Windows/Linux) or `Cmd + Shift + R` (Mac)
+4. **Safari**: Press `Cmd + Option + R`
+
+### Method 2: Clear Cache via Developer Tools
+1. Open Developer Tools (F12)
+2. Right-click the refresh button
+3. Select **"Empty Cache and Hard Reload"**
+
+### Method 3: Disable Cache in Developer Tools
+1. Open Developer Tools (F12)
+2. Go to **Network** tab
+3. Check **"Disable cache"** checkbox
+4. Keep Developer Tools open while testing
+5. Refresh the page
+
+### Method 4: Clear Browser Cache Completely
+1. Open browser settings
+2. Navigate to Privacy/Clear browsing data
+3. Select "Cached images and files"
+4. Choose "Last hour" or "All time"
+5. Click "Clear data"
+6. Refresh the page
+
+## Verification
+
+After clearing cache, you should see:
+- ✅ New console messages with detailed error logging
+- ✅ "Loading stats, blocks, and transactions..." message
+- ✅ "Fetching blocks from Blockscout: [URL]" message
+- ✅ Either success messages or detailed error information
+
+## Expected Console Output (After Fix)
+
+**Success:**
+```
+Ethers loaded from fallback CDN
+Ethers ready, initializing...
+Loading stats, blocks, and transactions...
+Fetching blocks from Blockscout: https://explorer.d-bis.org/api/v2/blocks?page=1&page_size=10
+✅ Loaded 10 blocks from Blockscout
+```
+
+**If Error:**
+```
+❌ API Error: {status: 400, ...}
+🔍 HTTP 400 Bad Request Details:
+URL: https://explorer.d-bis.org/api/v2/blocks?page=1&page_size=10
+Response Headers: {...}
+Error Body: {...}
+```
+
+## Note
+The API works correctly (verified via curl), so any HTTP 400 errors after clearing cache will show detailed information to help diagnose the actual issue.
+