docs: update roadmap and todo with recent changes

ROADMAP.md

@@ -329,6 +329,25 @@ PPF (Proxy Fetcher) is a Python 2 proxy scraping and validation framework design
 - [x] Content hash deduplication for stale proxy list detection
 - [x] stale_count reset when content hash changes
 
+### Distributed Workers (Done)
+- [x] Worker registration and heartbeat system
+- [x] /api/workers endpoint for worker status monitoring
+- [x] Tor connectivity check before workers claim work
+- [x] Worker test rate tracking with sliding window calculation
+- [x] Combined rate aggregation across all workers
+- [x] Dashboard worker cards showing per-worker stats
+
+### Dashboard Performance (Done)
+- [x] Keyboard shortcuts: r=refresh, 1-9=tabs, t=theme, p=pause
+- [x] Tab-aware chart rendering - skip expensive renders for hidden tabs
+- [x] Visibility API - pause polling when browser tab hidden
+- [x] Dark/muted-dark/light theme cycling
+
+### Proxy Validation Cache (Done)
+- [x] LRU cache for is_usable_proxy() using OrderedDict
+- [x] Thread-safe with lock for concurrent access
+- [x] Proper LRU eviction (move_to_end on hits, popitem oldest when full)
+
 ---
 
 ## Technical Debt
@@ -350,13 +369,22 @@ PPF (Proxy Fetcher) is a Python 2 proxy scraping and validation framework design
 | ppf.py | Main URL harvester daemon | Active, cleaned |
 | proxywatchd.py | Proxy validation daemon | Active, enhanced |
 | scraper.py | Searx search integration | Active, cleaned |
-| fetch.py | HTTP fetching with proxy support | Active |
+| fetch.py | HTTP fetching with proxy support | Active, LRU cache |
 | dbs.py | Database schema and inserts | Active |
 | mysqlite.py | SQLite wrapper | Active |
 | rocksock.py | Socket/proxy abstraction (3rd party) | Stable |
 | http2.py | HTTP client implementation | Stable |
+| httpd.py | Web dashboard and REST API server | Active, enhanced |
 | config.py | Configuration management | Active |
 | comboparse.py | Config/arg parser framework | Stable, cleaned |
 | soup_parser.py | BeautifulSoup wrapper | Stable, cleaned |
 | misc.py | Utilities (timestamp, logging) | Stable, cleaned |
 | export.py | Proxy export CLI tool | Active |
+| engines.py | Search engine implementations | Active |
+| connection_pool.py | Tor connection pooling | Active |
+| network_stats.py | Network statistics tracking | Active |
+| dns.py | DNS resolution with caching | Active |
+| mitm.py | MITM certificate detection | Active |
+| job.py | Priority job queue | Active |
+| static/dashboard.js | Dashboard frontend logic | Active, enhanced |
+| static/dashboard.html | Dashboard HTML template | Active |