docs(blog): bring the 4.8 release post up to the final changelog

[localai-bot]

Why

website/content/blog/what-landed-in-localai-4-8.md was written against the first draft of the release notes, when the cycle stood at 214 PRs over thirteen days. It closed at 321 PRs over eighteen days, and three of the larger user-facing changes landed after the post was written. As it stands the post opens with figures that are wrong and omits a whole new modality.

.agents/preparing-a-release.md makes the post and the clips part of the release rather than a follow-up, so this brings it in line with the final changelog.

What changed

Counts corrected throughout: 321 PRs, eighteen days, 24 contributors (11 first-time), gallery 1,221 to 1,505. Front matter summary and tags updated with it.

Three new sections for what landed after the first draft:

• LocalAI generates 3D models now - a new modality end to end (Generate3D RPC, FLAG_3D, POST /v1/3d/generations, the trellis2cpp backend, GLB viewer, print remeshing). feat: Add 3d generation UI/API and trellis2cpp backend #10979
• One backend, six audio endpoints - audio-cpp and the family-from-GGUF-metadata design, with the endpoint table, plus the two changes that reach past the backend (stems on AudioTransformResult, and the 16 kHz mono fold becoming a per-backend capability). feat(audio-cpp): add the audio.cpp native backend #11141
• The operations bar became a page - the one-line strip, the ✕ no longer cancelling, and the Activity page with its bounded record. feat(ui): replace the stacked operations bar with a one-line strip and an Activity page #11163

Also covered: the two further hardening fixes (tar hardlink escape #11266, cyclic $ref stack overflow #11041) alongside the TRL one; and the Valkey store, systemd socket activation, persistent trace history, in-place chat message editing, the self-contained SYCL backend and the site split in the closing section.

Reordered so the new-engine sections sit together instead of being split across the operational ones.

Clips

Per the clip conventions in .agents/preparing-a-release.md, the post now embeds three:

• vllm-race.mp4 and magpie.mp4, both already in website/static/media/
• 3d-generation.mp4, new: cut from the 3D demo recording to 14s at 1000x562, audio track stripped, 201 KB, which puts it in line with the existing clips (hero-ui 185 KB, parakeet-duel 192 KB). Named for the feature rather than the release so it stays reusable.

One CSS fix

blog.css styled .bp-body figure img but not .bp-body figure video, so a clip embedded in a post rendered outside the card that images get. Both selectors now share the rule. This is why no blog post embedded a video before.

Verification

• hugo builds clean from website/, post renders, all three <video> tags emit with the site's muted loop playsinline preload="none" data-lazy pattern, and all three referenced media files resolve in the built output.
• No em dashes.