Fixes self-hosting docs to match the `supermemory-server` binary.
- **Ingest example.** `?dreaming=instant` was in the URL in the quickstart; it's now in the body.
- **Startup.** The banner example is accurate. The plaintext `env` file is legacy: it's moved into the encrypted `env.enc` and then deleted.
- **Providers:**
- The provider order is OpenAI → Anthropic → Gemini → Vertex → Groq → Workers AI.
- PDF extraction needs `GEMINI_API_KEY` (Vertex doesn't help).
- URL ingestion uses Firecrawl and needs `FIRECRAWL_API_KEY`.
- **Smaller fixes:**
- The SDK option is `baseUrl`.
- Documented the environment switches the binary honors.
- Embedding defaults are corrected.
- Removed the claim that the hosted platform uses the same embedding stack.
Checked against the current API and the published SDKs (TS 5.0.1, Python 5.0.0). Legacy v3/v4 docs are unchanged apart from factual fixes.
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