init elowdb go-port commit

examples/custom-json/test-linedb-custom-json/id-first/products.jsonl

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+{"id":2,"category":"Books","createdAt":1754974225,"inStock":false,"name":"ID First Product","price":123.45,"sellerId":1}                                                                                                                                       

examples/custom-json/test-linedb-custom-json/id-first/users.jsonl

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+{"id":1,"createdAt":1754974225,"email":"id_first@example.com","isActive":true,"role":"user","username":"id_first_user"}                                                                                                                                        

examples/custom-json/test-linedb-custom-json/standard/users.jsonl

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+{"createdAt":1754974225,"email":"standard@example.com","id":2,"isActive":true,"role":"admin","username":"standard_user"}