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### What problem does this PR solve?
Document list and filter supports metadata filtering.
**OR within the same field, AND across different fields**
Example 1 (multi-field AND):
```markdown
Doc1 metadata: { "a": "b", "as": ["a", "b", "c"] }
Doc2 metadata: { "a": "x", "as": ["d"] }
Query:
metadata = {
"a": ["b"],
"as": ["d"]
}
Result:
Doc1 matches a=b but not as=d → excluded
Doc2 matches as=d but not a=b → excluded
Final result: empty
```
Example 2 (same field OR):
```markdown
Doc1 metadata: { "as": ["a", "b", "c"] }
Doc2 metadata: { "as": ["d"] }
Query:
metadata = {
"as": ["a", "d"]
}
Result:
Doc1 matches as=a → included
Doc2 matches as=d → included
Final result: Doc1 + Doc2
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)