refactor: P0-P3 fixes, C1 cleanup, architecture diagrams, go.work upgrade

- P0-1: ProviderError type + ReportStatus for precise 401/403 detection
- P0-2: Remove -config flag from deploy/homeagent.service
- P2-1: 5s debounce on context.go Save()
- P2-2→C1: Delete output_set_channel entirely
- P2-3: Extract mediaDataURL/mediaChat helpers
- P2-4: Dedup defaultSources var
- P3: Delete dead packages (embed/tokenizer/container/snapshot)
- P3: Delete dead functions (messagesToMap, RunStageAll)
- CL: Update .gitignore, docs, Makefile, gojieba removal
- Config: Delete config/config.yaml, update docs
- Arch: Remove EmitOutputTo from emitResponse
- CL-1: go.work 1.19→1.21
- Docs: Add Mermaid architecture diagrams to README
- Docs: Add kernel-rebuild requires plugin-rebuild note to PLUGIN_DEV.md

docs/ADAPTER.md

@@ -98,7 +98,5 @@ return adapter
 1. 在 `internal/lua/adapters/` 下创建 `<name>.lua`
 2. 脚本定义 `transform_request` 和 `transform_response`
 3. （可选）定义 `transform_stream_chunk` 支持流式
-4. 在 `config/config.go` 的 `Sources` 中添加条目
-5. 在 `config/config.yaml` 中添加对应源
-6. 编译验证：`go build ./cmd/homed/`
-7. 测试验证：`go test ./...`
+4. 编译验证：`go build ./cmd/homed/`
+5. 测试验证：`go test ./...`