feat: add powermem as a longtermmemory provider

[PsiACE]

AgentScope Version

The main branch of AgentScope

Description

Added PowerMem integration as a new long-term memory backend for AgentScope.

Changes Made:

• Implemented PowerMemLongTermMemory class supporting OceanBase/seekdb as vector store
• Included example code demonstrating all memory operations with DashScope LLM

How to Test:

1. Start OceanBase-CE or seekdb container: docker run -d --name oceanbase-ce --cpus=2 --memory=4g -p 2881:2881 quay.io/oceanbase/oceanbase-ce:latest
2. Configure .env file with API keys and database settings
3. Run example: python examples/functionality/long_term_memory/powermem/memory_example.py
4. Verify data in database: SELECT * FROM powermem.memories;

Tested on OceanBase-CE 4.3.5.5 and seekdb .

$docker exec oceanbase-ce obclient -h172.17.0.2 -P2881 -uroot@sys -Dpowermem -e "SELECT id, document, metadata, CASE WHEN embedding IS NULL THEN 'No' ELSE 'Yes' END as has_embedding FROM memories LIMIT 3;"
id      document        metadata        has_embedding
663653407965315072      Prefers to stay in homestays when traveling to Hangzhou {"_fusion_info": {"fts_rank": 1, "rrf_score": 0.01639344262295082, "fts_weight": 0.5, "vector_rank": 1, "fusion_method": "rrf", "vector_weight": 0.5}, "search_count": 5, "last_searched_at": "2026-01-06T08:02:09.820780+00:00"}       Yes
663653408061784064      Likes to visit the West Lake in the morning     {"_fusion_info": {"fts_rank": null, "rrf_score": 0.008064516129032258, "fts_weight": 0.5, "vector_rank": 2, "fusion_method": "rrf", "vector_weight": 0.5}, "search_count": 5, "last_searched_at": "2026-01-06T08:02:09.820802+00:00"}   Yes
663653408082755584      Enjoys drinking Longjing tea    {"_fusion_info": {"fts_rank": null, "rrf_score": 0.007936507936507936, "fts_weight": 0.5, "vector_rank": 3, "fusion_method": "rrf", "vector_weight": 0.5}, "search_count": 4, "last_searched_at": "2026-01-06T08:02:09.820837+00:00"}   Yes

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with pre-commit run --all-files command
• All tests are passing
• Docstrings are in Google style
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[PsiACE]

We compared the results of the mem0 and powermem examples to verify that the work was correct.