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/05_aggregation_tables.sql

@@ -40,6 +40,19 @@ SOURCE(FILE(path '/var/lib/clickhouse/user_files/asn_reputation.csv' format 'CSV
 LAYOUT(HASHED())
 LIFETIME(MIN 300 MAX 300);
 
+DROP DICTIONARY IF EXISTS ja4_processing.dict_browser_ja4;
+CREATE DICTIONARY ja4_processing.dict_browser_ja4
+(
+    ja4            String,
+    browser_family String,
+    tls_library    String,
+    context        String
+)
+PRIMARY KEY ja4
+SOURCE(FILE(path '/var/lib/clickhouse/user_files/browser_ja4.csv' format 'CSV'))
+LAYOUT(COMPLEX_KEY_HASHED())
+LIFETIME(MIN 300 MAX 300);
+
 
 -- -----------------------------------------------------------------------------
 -- agg_host_ip_ja4_1h — behavioral aggregation (L4/L5/L7)