feat: browser JA4 detection, Anubis bot rules, worldwide ASN data

- Add generate_browser_ja4.py: 1,186 browser JA4 fingerprints from FoxIO + ja4db.com
  covering 11 families (Chromium, Firefox, Safari, Edge, Tor, Opera, Vivaldi...)
- Rewrite generate_bot_ip.py: Anubis YAML rules (Google, Bing, Apple, DuckDuck,
  OpenAI, Perplexity bots) + Tor exit nodes + cloud scanner IPs (3,555 entries)
- Rewrite generate_asn_data.py: worldwide iptoasn.com data (78,049 ASNs, 714K CIDRs)
- Add dict_browser_ja4 ClickHouse dictionary + browser_family in AI features views
- Add /api/browsers dashboard endpoint
- Fix CSV quoting for fields containing commas (User-Agent strings)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

shared/clickhouse/07_ai_features_view.sql

@@ -17,6 +17,7 @@ WITH base_data AS (
             nullIf(dictGetOrDefault('ja4_processing.dict_bot_ja4', 'bot_name', tuple(a.ja4), ''), ''),
             ''
         ) AS bot_name,
+        dictGetOrDefault('ja4_processing.dict_browser_ja4', 'browser_family', tuple(a.ja4), '') AS browser_family,
         -- Anubis: combined UA+IP priority logic > UA only > IP only > ASN > Country
         CASE
             WHEN dictGet('ja4_processing.dict_anubis_ua', 'has_ip', a.first_ua) = '1'