feat: suggest dataservice description

[bolinocroustibat]

Add AI-powered description suggestion for dataservices (external APIs) via the Albert API.

When editing a dataservice, a "Suggérer une description" button generates a French description. The button is enabled only when:

• title is filled
• at least one of these is filled: technical documentation URL or machine documentation URL (OpenAPI/Swagger)

Changes:

• DescribeDataservice.vue: suggestion button with loading/disabled states and tooltip; enabled when title + at least one doc URL are present
• generate-dataservice-description.post.ts (new): Nitro endpoint that fetches documentation from the given URLs, inlines it into the prompt, and calls Albert API. Requires title and at least one of technicalDocumentationUrl or machineDocumentationUrl
• fetch-documentation.ts (new): utility to fetch doc content from URLs (HTML stripped, JSON/YAML as-is; 15s timeout, 120k char cap)

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EDIT (2026-02-17):

• generate-dataservice-description.post.ts uses shared callAlbertAPI (albert-helpers), same pattern as other Albert endpoints.
• Doc content is now fetched from the URLs and inlined into the prompt (new fetch-documentation.ts: HTML stripped, JSON/YAML as-is, 15s timeout, 120k char cap). Previously only the URLs were sent.
• Fixed 422 "description too short" being rethrown as 500.
• Removed redundant validateAlbertConfig from helper and all Albert endpoints.

[ThibaudDauce]

Thanks! Really sorry for the delay :-(

[bolinocroustibat]

Let's not merge that yet, I would first like to:

• change the order of the form fields - URLS fields must be before description fields
• see why we sometimes have foreign language words in the generated description