Fix OpenClaw Mem0 custom categories payload

[mjzcng]

Summary

Fixes OpenClaw Mem0 auto-capture category overrides so they match the Mem0 SDK/platform list shape.

OpenClaw stores customCategories as a category-name-to-description map, while mem0ai@3.0.3 expects customCategories to be an array of single-key category objects. Passing the map directly causes platform validation errors during capture.

Changes

• Adds customCategoryMapToList() to convert OpenClaw category maps into the Mem0 SDK list shape.
• Uses that conversion when building auto-capture add options.
• Updates the internal AddOptions.custom_categories type to the list shape.
• Adds regression tests for the conversion and platform SDK forwarding.

Validation

• ./node_modules/.bin/vitest run tests/providers.test.ts
• ./node_modules/.bin/tsc --noEmit
• ./node_modules/.bin/vitest run
• ./node_modules/.bin/tsup

Fixes #5344

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