feat: Console SDK update for version 8.2.0

[ChiragAgg5k]

This PR contains updates to the Console SDK for version 8.2.0.

[greptile-apps]

Greptile Summary

This PR updates the Console SDK to version 8.2.0, introducing two new Migrations service methods (createJSONExport and createJSONImport), adding Dart311 and Flutter341 runtime variants across all three runtime enum files, marking Block.reason and Block.expiredAt as optional, and upgrading the build toolchain to Rollup v4 with ESM config and a Node ≥18 engine requirement.

Key changes:

• New Migrations endpoints: createJSONExport (POST /migrations/json/exports) and createJSONImport (POST /migrations/json/imports) follow the existing dual-overload pattern and correctly validate required parameters before constructing the request payload.
• Runtime enum additions: Dart311 = 'dart-3.11' and Flutter341 = 'flutter-3.41' are added symmetrically to BuildRuntime, Runtime, and Runtimes enums — all three files remain in sync.
• Model update: Block.reason and Block.expiredAt are now typed as string | undefined (?), reflecting that the API can return null for these fields.
• Toolchain upgrade: Rollup config migrated to .mjs ESM syntax; package.json now requires Node ≥18 and pins rollup at 4.60.1; package-lock.json is updated accordingly.
• Doc improvements: Datetime placeholder examples changed from empty strings to a concrete ISO-8601 value (2020-10-15T06:38:00.000+00:00), improving clarity for SDK consumers.

Confidence Score: 5/5

This PR is safe to merge — all changes are well-structured, consistent, and additive.

No P0 or P1 issues were found. New methods follow established patterns, enum files are kept in sync, and model field changes correctly reflect the API contract. The Rollup v4 upgrade is straightforward. Score of 5 reflects that all remaining considerations are cosmetic (missing JSDoc description on the two new migration methods) and do not affect correctness or runtime behavior.

No files require special attention.

Important Files Changed

Filename	Overview
src/services/migrations.ts	Added createJSONExport() and createJSONImport() methods with correct dual-overload pattern, required-parameter guards, and proper API paths/content-type headers.
src/enums/build-runtime.ts	Added Dart311 ('dart-3.11') and Flutter341 ('flutter-3.41') variants, consistent with runtime.ts and runtimes.ts.
src/enums/runtime.ts	Added Dart311 and Flutter341 variants, mirroring build-runtime.ts.
src/enums/runtimes.ts	Added Dart311 and Flutter341 variants, in sync with the other two runtime enum files.
src/models.ts	Block.reason and Block.expiredAt changed to optional (?) fields; ProxyRule field descriptions improved.
src/client.ts	x-sdk-version header bumped to 8.2.0; no logic changes.
package.json	Version bumped to 8.2.0, Node >=18 engine requirement added, rollup upgraded to 4.60.1.
rollup.config.mjs	Migrated to ESM (.mjs) syntax for Rollup v4 compatibility; build outputs unchanged.
CHANGELOG.md	8.2.0 release notes added; pre-existing misplaced CLI 17.3.0 section is a separate thread topic.
src/services/health.ts	No new methods or logic changes in the reviewed sections.

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