Add episode 69: GraphQL:治好前后端联调内耗

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What

Adds the new podcast episode EP69 GraphQL:治好前后端联调内耗 as requested in #73.

New file: src/content/posts/ep69.mdx (follows the exact pattern of ep66–ep68). No other changes are needed — the site is fully dynamic, so the episode list, /posts/ep69 route, OG image, and RSS item are all generated automatically.

Field mapping (from the issue)

Field	Value
title	EP69 GraphQL:治好前后端联调内耗 (prefixed EP69 so the OG-image generator can extract the number)
shownotes	the issue's description, verbatim (trailing hashtags dropped, BGM by Otologic appended — matching existing episodes)
xyzLink / url	https://www.xiaoyuzhoufm.com/episode/6a3bab23ffcf45052c119264
youtubeId	t-8Ry_4s3mo
biliUrl	//player.bilibili.com/player.html?...bvid=BV13y7K6EE2b... (protocol-relative, & decoded)
categories	graphql, api, restful, schema, frontend, backend, fullstack, ai (issue tags + core topics, in the repo's English-keyword convention)
status	published
publicationDate	2026-06-24

Note on the date: both external pages were unreachable from the build environment, so the date was derived from the xiaoyuzhou episode id (a Mongo ObjectId whose first 4 bytes encode the creation time): 0x6a3bab23 → 2026-06-24. The method was validated against ep67 (6a2945a0 → 06-10 ✓) and ep68 (6a33665a → 06-18 ✓).

Verification

• astro content sync succeeds → the new MDX passes content-collection schema validation.
• The built /posts/index.html lists ep69 at the top (newest first), confirming the publication date sorts it correctly above ep68.
• A full local astro build stops at the OG-image step because this sandbox can't fetch the remote logo ik.imagekit.io/...asynctalk-logo.png (fails on ep0-og.png, unrelated to this change; works in CI where the asset is reachable).
• The 3 astro check errors are pre-existing in scripts/face.ts and scripts/generate-thumbnail.ts — untouched by this PR.

Closes #73

🤖 Generated with Claude Code

https://claude.ai/code/session_01LWxmEg2yd4HuhxtWzrTyaP

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