feat: API specs update for version 2.0.x

[appwrite-specifications]

This PR contains API specification updates for version 2.0.x.

[greptile-apps]

Too many files changed for review (498 files, 200 file limit).

Bypass the limit by tagging @greptile-apps to review.

[ChiragAgg5k]

Review: holding merge. The invoice response/security changes are correct, but this regeneration newly publishes broken examples:

• examples/2.0.x/client-apple/examples/{documentsdb,vectorsdb}/create-operations.md:13–20: JSON objects are emitted instead of Swift dictionaries. Reproduced with swiftc -frontend -parse - on the vectorsdb example: “expected expression”.
• examples/2.0.x/client-graphql/examples/{documentsdb,vectorsdb}/create-operations.md:7–12: quoted input field names are invalid GraphQL syntax.
• examples/2.0.x/client-apple/examples/vectorsdb/create-document.md:15–20: embeddings are rendered as a string-keyed dictionary instead of a numeric array.

The first two originate in existing generator templates and are now propagated into newly added files; they are not caused by the invoice response fix. Fix the generator output and regenerate before merging this broader examples update. The separate latest spec-only PR #109 does not include these example defects.