fix: escape single quotes in Infinity SQL filter conditions (#14186)

### What problem does this PR solve?

## Summary

Fixes #5939

Entity names containing single quotes (e.g., `投影直线L'`) caused SQL syntax
errors when building filter conditions for Infinity queries, due to
unescaped string interpolation in `equivalent_condition_to_str`.

## Changes

In `common/doc_store/infinity_conn_base.py`, added `.replace("'", "''")`
escaping for string values in two branches of
`equivalent_condition_to_str` where it was missing:

1. **`field_keyword` branch with non-list value** (line 190): The list
branch already escaped single quotes on line 183, but the single-string
branch did not.
2. **Plain string value branch** (line 209): Direct f-string
interpolation `{k}='{v}'` was vulnerable to unescaped quotes.

Both fixes use the same SQL-standard escape pattern (`'` → `''`) already
applied elsewhere in this method.

## How to Test

1. Upload a document containing entity names with single quotes.
2. Enable Knowledge Graph (GraphRAG) in the parsing configuration.
3. Initiate document parsing — it should complete without SQL syntax
errors.

## Note

The original issue also reported a typo (`dge_graph_kwd` instead of
`knowledge_graph_kwd`), which has already been fixed in the current
codebase.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Signed-off-by: noob <yixiao121314@outlook.com>

common/doc_store/infinity_conn_base.py

@@ -187,7 +187,8 @@ class InfinityConnectionBase(DocStoreConnection):
                         strInCond = f"({strInCond})"
                         cond.append(strInCond)
                 else:
-                    cond.append(f"filter_fulltext('{self.convert_matching_field(k)}', '{v}')")
+                    escaped_v = str(v).replace("'", "''")
+                    cond.append(f"filter_fulltext('{self.convert_matching_field(k)}', '{escaped_v}')")
             elif isinstance(v, list):
                 inCond = list()
                 for item in v:
@@ -206,7 +207,8 @@ class InfinityConnectionBase(DocStoreConnection):
                         if kk == "exists":
                             cond.append("NOT (%s)" % exists(vv))
             elif isinstance(v, str):
-                cond.append(f"{k}='{v}'")
+                escaped_v = v.replace("'", "''")
+                cond.append(f"{k}='{escaped_v}'")
             elif k == "exists":
                 cond.append(exists(v))
             else: