Rework bot taxonomy: provider field, social/analytics kinds, spoof detection

- Distinguish Meta's five documented crawlers (Facebook, FacebookBot,
  Meta-ExternalAgent/ExternalFetcher/WebIndexer) with distinct kinds
- Rename kind preview -> social for link-sharing unfurlers; BingPreview
  moves to search as it is a search-engine feature
- Add analytics kind for monitoring and ad/SEO measurement crawlers
  (UptimeRobot, Pingdom, MJ12bot, Mediapartners-Google, AdsBot-Google)
- Reclassify Google family by main product use: Storebot-Google and
  Feedfetcher-Google/InspectionTool are search, Read-Aloud and
  GoogleOther are ai; AhrefsBot is search
- Drop retired entries: DuplexWeb-Google, SkypeUriPreview, PhantomJS
- Detect the Qualys SSL Labs scanner by its frozen exact UA string
- Mark ancient (pre-2023) auto-updating browser claims with
  " (spoofed)" in pretty, leaving engine/os/kind empty
- UA dataclass: all fields default to "", new provider field,
  constructions use kwargs
- PROVIDERS is now dict[provider, frozenset[names]] with derived
  PROVIDER_OF and NAME_KIND reverse lookups
- README and prettytable.py updated to match

scripts/prettytable.py

@@ -55,10 +55,6 @@ CASES = [
         "Googlebot (disguised)",
         "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
     ),
-    (
-        "Claude-SearchBot (disguised)",
-        "Mozilla/5.0 (Linux; Android 13; Pixel 7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.3245.171 Mobile Safari/537.36; compatible; Claude-SearchBot/1.0; +https://www.anthropic.com/claude-searchbot",
-    ),
     (
         "Facebook preview (disguised)",
         "Mozilla/5.0 (Linux; Android 13; Pixel 7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.6885.65 Mobile Safari/537.36; compatible; facebookexternalhit/1.1; +http://www.facebook.com/externalhit_uatext.php",