Full internal rename: metapi → boosapi

Rename all remaining internal protocol identifiers:
- x-metapi-* headers → x-boosapi-*
- metapi: reasoning prefix → boosapi:
- __metapi* runtime markers → __boosapi*
- file-metapi-* → file-boosapi-*
- METAPI_* env vars → BOOSAPI_*
- metapi_turn_state/metapi_mcp_item__ etc. → boosapi_*
- package.json name → boosapi
- Docker/deploy/k3s/docs references

46 files changed, 168 insertions, 170 deletions.
typecheck:web passes (0 new errors).

Signed-off-by: Boos4721 <boos4721@icloud.com>

docs/.vitepress/config.ts

@@ -72,7 +72,7 @@ export default withMermaid(
         { text: 'OAuth 管理', link: '/oauth' },
         { text: 'FAQ', link: '/faq' },
         { text: '文档维护', link: '/README' },
-        { text: '项目主页', link: 'https://github.com/cita-777/metapi' },
+        { text: '项目主页', link: 'https://github.com/cita-777/boosapi' },
       ],
       sidebar: [
         {
@@ -106,7 +106,7 @@ export default withMermaid(
         },
       ],
       socialLinks: [
-        { icon: 'github', link: 'https://github.com/cita-777/metapi' },
+        { icon: 'github', link: 'https://github.com/cita-777/boosapi' },
       ],
       outline: {
         level: [2, 3],