Adjusted docker manifests and environment variables for OceanBase vector database

[powerfooI]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

This PR makes vector module of oceanbase database turn on automatically after composed up as the main purpose. By the way, it sets database password to default non-empty value and adds some comments for oceanbase vector database.

Fixes #10394

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

I have tested the change and it works as expect.

1. Edit VECTOR_STORE=oceanbase in .env
2. Compose up containers with docker compose --profile oceanbase up -d
3. Store and retrieve vector data as usual without any other manual configuration