feat(bench-102): Moonshot + Meteora DBC discovery, fix venue defaults, drop wow/clanker

[Flotapponnier]

Summary

• New discovery: gecko_solana.go adds dedicated GeckoTerminal fetchers for Moonshot (/dexes/moonshot/pools) and Meteora DBC (/dexes/meteora-dbc/pools) on Solana. Both confirmed working from VPS. Pre-assigns venue labels so these tokens skip the Dexscreener enrichment step.
• Fix venue defaults: venueFromPair Solana default was "pump-fun" (mislabeling Raydium/Orca tokens); Base default was "virtuals". Both now return "all" so unknown-DEX tokens land in the aggregate bucket, not misattributed to a launchpad.
• Drop wow + clanker: WOW.XYZ has no public API (returns HTML from VPS); api.clanker.world DNS fails from VPS. Neither has a GeckoTerminal dex slug. Removed from YAML venue dimensions and all text references.
• Scheduler: 5 concurrent discovery goroutines (was 3). Discovery runs Dexscreener boosts, Virtuals, GeckoTerminal BSC, GeckoTerminal Moonshot, GeckoTerminal Meteora DBC.
• YAML cleanup: Updated seo_description, subtitle, methodology, findings, faq to reflect 6 launchpads and remove Odos/WOW/Clanker refs.

Test plan

• Go build passes (verified locally)
• Merge to dev, staging deploy, verify moonshot + meteora-dbc probe counters appear in Prom
• Rebuild materialize-worker on VPS after merge