docs: add multi-language documentation (ru, fa, zh, tr, ar)
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# موتور جستجوی تماممتن
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اندیس معکوس با رتبهبندی BM25 و TF-IDF.
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## استفاده
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```nim
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import barabadb/fts/engine
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var idx = newInvertedIndex()
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idx.addDocument(1, "Nim is a fast programming language")
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idx.addDocument(2, "Python is popular for data science")
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let results = idx.search("programming language")
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let fuzzy = idx.fuzzySearch("programing", maxDistance = 2)
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```
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## روشهای رتبهبندی
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### BM25
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```nim
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let bm25 = idx.searchBM25("query terms")
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```
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### TF-IDF
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```nim
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let tfidf = idx.searchTfidf("query terms")
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```
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## ویژگیهای جستجو
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| ویژگی | توضیح |
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|--------|--------|
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| Fuzzy search | تساهل فاصله Levenshtein |
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| Wildcard | پیشوند، پسوند، میانوند |
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| Regex | الگوهای regular |
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| Phrase search | تطبیق عبارت دقیق |
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| Boolean | عملگرهای AND, OR, NOT |
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## رابط SQL
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```sql
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CREATE INDEX idx_fts ON articles(body) USING FTS;
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SELECT * FROM articles WHERE body @@ 'machine learning';
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```
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