Review PR #2313: Fee stats analytics docs refresh

[Copilot]

PR #2313 refreshes the Hubble fee stats documentation to reflect the deprecation of fee_stats_agg in favor of two new granular models.

What was reviewed

• Analyst guide (queries-for-horizon-like-data.mdx): Deprecation note added; old single query replaced with two new sections — Retrieve Daily Fee Stats and Retrieve Ledger-Level Fee Stats — each targeting the new BigQuery tables
• New data dictionary pages:
  • gold/ledger-fee-stats-agg.mdx (sidebar_position: 81) — per-ledger grain, includes Classic/Soroban breakdowns, inclusion fee metrics, surge pricing flags
  • gold/daily-fee-stats-agg.mdx (sidebar_position: 82) — daily rollup with surge percentages and ledger-count summaries
• routes.txt: Two new routes registered for the new dictionary pages

Issues resolved

A prior automated review flagged that the Documentation rows in both new .mdx files were malformed — prefixed with an MDX comment instead of being valid table rows. This was fixed in the "Remove TODOs, docs are verified" commit:

-{/* TODO: Verify dbt docs link ... */} | Documentation | [dbt docs](...) |
+| Documentation | [dbt docs](http://www.stellar-dbt-docs.com/#!/model/model.stellar_dbt_public.daily_fee_stats_agg) |

Both files now follow the same structure as existing gold-layer data dictionary pages (fee-stats-agg.mdx, asset-balances-daily-agg.mdx, etc.), with consistent dbt docs URL format and <div className="scoped-data-dictionary-table"> wrapper.

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