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

cmd/homed/main.go

@@ -20,6 +20,7 @@ import (
 	internalConfig "gitcode.com/JianFeeeee/HomeAgent/internal/config"
 	"gitcode.com/JianFeeeee/HomeAgent/internal/events"
 	"gitcode.com/JianFeeeee/HomeAgent/internal/knowledge"
+	"gitcode.com/JianFeeeee/HomeAgent/internal/meta"
 	luapkg "gitcode.com/JianFeeeee/HomeAgent/internal/lua"
 	"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
 	"gitcode.com/JianFeeeee/HomeAgent/internal/memory/document"
@@ -79,7 +80,7 @@ func main() {
 		}
 	}
 
-	log.Printf("[homed] starting HomeAgent v0.1.0 (pure kernel)")
+	log.Printf("[homed] starting %s", meta.FullVersion())
 
 	agentWorkDir := filepath.Join(*dataDir, "agentfs")
 	dirs := []string{