fix(docs): resolve broken API reference links and legacy startReward references

[vhtgzzl]

Summary

This PR addresses two areas of documentation integrity across the Tempo documentation site (\docs.tempo.xyz):

1. Resolves 16 Broken Internal API Links (/docs/api/*\ 404 Routes):

   • Several pages (\src/pages/docs/api.mdx, \src/pages/docs/api/faq.mdx, \src/pages/docs/api/indexer-api.mdx, \src/pages/docs/server/relay-handler.mdx) previously referenced subroutes such as /docs/api/activities, /docs/api/webhooks, /docs/api/balances, /docs/api/funding/quotes, /docs/api/funding/transfers, /docs/api/funding/deposit-addresses, /docs/api/exchange, /docs/api/indexer, and /docs/api/verified-tokens.
   • These endpoints are hosted under the unified OpenAPI reference page (/docs/api/reference). All links are updated to their canonical OpenAPI tag anchors (/docs/api/reference#tag/...).

2. Clarifies Legacy \startReward\ References in Protocol Specifications:

   • \src/pages/docs/protocol/fees/spec-fee.mdx: Removed deprecated \startReward\ from active TIP-20 fee-token inference method lists.
   • \src/pages/docs/protocol/transactions/spec-tempo-transaction.mdx: Removed \startReward\ from limited Access Key spending limit tracking scopes, matching current TIP-20 behavior post-T7/T8 upgrades.

Resolves #741

Changes Made

• \src/pages/docs/api.mdx: Updated 7 links in Common Workflows to canonical /docs/api/reference#tag/*\ anchors.
• \src/pages/docs/api/faq.mdx: Updated 4 links in FAQ answers to /docs/api/reference#tag/*.
• \src/pages/docs/api/indexer-api.mdx: Updated \GET /v1/indexer/query\ and indexer reference links to /docs/api/reference#tag/indexer.
• \src/pages/docs/server/relay-handler.mdx: Updated verified-token list links to /docs/api/reference#tag/tokens.
• \src/pages/docs/protocol/fees/spec-fee.mdx: Omitted \startReward\ from TIP-20 fee preference detection.
• \src/pages/docs/protocol/transactions/spec-tempo-transaction.mdx: Omitted \startReward\ from spending limit tracking.

Verification

• Audited all internal markdown links across \src/pages/docs/\ to ensure zero broken routes.
• Verified that all OpenAPI tags match the operations declared in
  eference.mdx\ and \�ocs.config.ts.
• Ensured formatting adheres to Conventional Commits and Vocs guidelines.

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