fix(NEW-A3 part1): replace em-dashes/smart-quotes in 56+ Python files -- CI requires pure ASCII source

fix

fix(BUG-06): replace full-scan MATCH(n) with 14 indexed label queries — HTTP 500 on non-English

fix(search): replace full-scan MATCH(n) with 9 indexed queries — fixes HTTP 500 on non-English search

fix(search+multilingual+sources): global search, fulltext index, sources API

feat(ai):complete — multilingual support for 22 Indian languages