feat: explorer API, wallet, CCIP scripts, and config refresh

- Backend REST/gateway/track routes, analytics, Blockscout proxy paths.
- Frontend wallet and liquidity surfaces; MetaMask token list alignment.
- Deployment docs, verification scripts, address inventory updates.

Check: go build ./... under backend/ (pass).
Made-with: Cursor

frontend/src/utils/watchlist.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from 'vitest'
+import {
+  isWatchlistEntry,
+  normalizeWatchlistAddress,
+  parseStoredWatchlist,
+  sanitizeWatchlistEntries,
+} from './watchlist'
+
+describe('watchlist utils', () => {
+  it('normalizes only valid addresses', () => {
+    expect(normalizeWatchlistAddress(' 0x1234567890123456789012345678901234567890 ')).toBe(
+      '0x1234567890123456789012345678901234567890',
+    )
+    expect(normalizeWatchlistAddress('not-an-address')).toBe('')
+  })
+
+  it('filters invalid entries and deduplicates case-insensitively', () => {
+    expect(
+      sanitizeWatchlistEntries([
+        '0x1234567890123456789012345678901234567890',
+        '0x1234567890123456789012345678901234567890',
+        '0x1234567890123456789012345678901234567890'.toUpperCase(),
+        'bad',
+        42,
+      ]),
+    ).toEqual(['0x1234567890123456789012345678901234567890'])
+  })
+
+  it('parses stored JSON safely', () => {
+    expect(parseStoredWatchlist('["0x1234567890123456789012345678901234567890"]')).toEqual([
+      '0x1234567890123456789012345678901234567890',
+    ])
+    expect(parseStoredWatchlist('not json')).toEqual([])
+  })
+
+  it('matches saved addresses case-insensitively', () => {
+    const entries = ['0x1234567890123456789012345678901234567890']
+    expect(
+      isWatchlistEntry(entries, '0x1234567890123456789012345678901234567890'.toUpperCase()),
+    ).toBe(true)
+  })
+})