docs: fix API Reference OpenAPI sources and redirects (#3368)

* docs: fix API Reference OpenAPI sources and redirects; clarify training data usage; add Mermaid diagram; correct CLI usage and notes

* docs(mintlify): use explicit openapi {source, directory} with absolute paths to fix branch deployment routing

* docs(mintlify): add explicit endpoint MDX pages and include in nav; keep OpenAPI auto-gen as fallback

* docs(mintlify): remove OpenAPI Endpoints groups; add localized MDX endpoint pages for pt-BR and ko

docs/ko/api-reference/inputs.mdx

@@ -0,0 +1,7 @@
+---
+title: "GET /inputs"
+description: "크루가 필요로 하는 입력 확인"
+openapi: "/enterprise-api.ko.yaml GET /inputs"
+---
+
+

docs/ko/api-reference/kickoff.mdx

@@ -0,0 +1,7 @@
+---
+title: "POST /kickoff"
+description: "크루 실행 시작"
+openapi: "/enterprise-api.ko.yaml POST /kickoff"
+---
+
+

docs/ko/api-reference/status.mdx

@@ -0,0 +1,7 @@
+---
+title: "GET /status/{kickoff_id}"
+description: "실행 상태 조회"
+openapi: "/enterprise-api.ko.yaml GET /status/{kickoff_id}"
+---
+
+