Fix LangChain and Docker quickstarts so they run as pasted

[cyborgcharlcye]

Why

A developer who copies the LangChain quick start from this page gets an ImportError (langchain_openai is not installed by the langchain extra) and then an API-key validation failure on the placeholder key; the Docker quickstart asks for sudo and docker-compose v1 and lists specs for an image we no longer ship. On v0.18.0 this is the difference between a first query in about two minutes and giving up.

What changed

• LangChain introduction, Embedded tab: uses the built-in all-MiniLM-L6-v2 model, api_key="" (free tier), and deletes the index at the end so the snippet can be re-run; adds the key-loss warning, a one-line "how to keep the index" pointer, a note that generate_key(save=True) is SDK-only, and OpenAI embeddings as an opt-in variant.
• Quickstart page, LangChain card: api_key="" and a key-retention comment.
• Quoted every pip install ...[extra] on current pages (zsh expands the brackets) and added a lint to scripts/docs.py check so it cannot regress.
• Docker quickstart: an "evaluating vs deploying" line, no sudo, docker compose v2, and specs that match the shipped image (python:3.14-slim, about 124 MB compressed, no PyTorch).
• Quickstart, Embedded quickstart and LangChain install steps: state that Python 3.10+ is required (macOS system python3 is 3.9 and pip install cyborgdb-core fails with no useful message on it).
• docs.json: a "Quickstart" navbar link, the Get API Key button now goes to cyborgdb.co/new (the bare domain redirects to the marketing site), and a /quickstart-docker short redirect for READMEs.

Verification

• Embedded snippet copied verbatim from the page into a fresh uv venv with cyborgdb-core[langchain]==0.18.0: run 1 and run 2 both print hello world / goodbye world (1.8 s and 0.4 s wall time); the reopen-by-constructor line was exercised the same way.
• python3 scripts/docs.py check, sync-next --check and seo --check all pass; sync-next mirrored five pages into next/.
• Not changed: the JS/TS tab still imports @langchain/openai; same class of issue, separate follow-up.

Closes cyborginc/cyborgdb-core#2706
Closes cyborginc/cyborgdb-core#2707
Closes cyborginc/cyborgdb-core#2708
Closes cyborginc/cyborgdb-core#2710
Refs cyborginc/cyborgdb-core#2705, cyborginc/cyborgdb-core#2701

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Project	Status	Preview	Updated
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