refactor(sdk): simplify provider lifecycle and registration logic

docs: remove Amp CLI integration guides and update references

docs: add model mapping documentation for Amp CLI integration

**docs: add Amp CLI integration guide to Chinese documentation**

security: fix localhost middleware header spoofing vulnerability

docs: reposition Amp CLI as integrated feature for upstream PR

feat(auth, docs): add SDK guides and local password support for management

remove all

feat(auth): enhance watcher with asynchronous dispatch and buffering

docs(sdk-access): add SDK usage guides in English and Chinese

feat: introduce custom provider example and remove redundant debug logs