docs: add multi-language documentation (ru, fa, zh, tr, ar)

docs/zh/graph.md

@@ -0,0 +1,42 @@
+# 图引擎
+
+具有内置算法的邻接表存储，用于图遍历和分析。
+
+## 用法
+
+```nim
+import barabadb/graph/engine
+
+var g = newGraph()
+let alice = g.addNode("Person", {"Name": "Alice"}.toTable)
+let bob = g.addNode("Person", {"Name": "Bob"}.toTable)
+discard g.addEdge(alice, bob, "knows")
+
+let bfs = g.bfs(alice)
+let path = g.shortestPath(alice, bob)
+let ranks = g.pageRank()
+```
+
+## 算法
+
+| 算法 | 描述 |
+|------|------|
+| `bfs` | 广度优先遍历 |
+| `dfs` | 深度优先遍历 |
+| `dijkstra` | 最短加权路径 |
+| `pageRank` | 节点重要性排名 |
+| `louvain` | 社区检测 |
+| `patternMatch` | 子图同构 |
+
+## Cypher 查询
+
+```nim
+import barabadb/graph/cypher
+
+var engine = newCypherEngine(g)
+let results = engine.execute("""
+  MATCH (p:Person)-[:KNOWS]->(friend:Person)
+  WHERE p.name = 'Alice'
+  RETURN friend.name
+""")
+```