docs: streamline AGENTS.md and simplify CLAUDE.md (#5685)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

 # CLAUDE.md
 
-Memos — self-hosted knowledge management platform. Go 1.25 backend, React 18 + TypeScript + Vite 7 frontend, Protocol Buffers API.
-
-See `AGENTS.md` for full architecture, workflows, and patterns.
-
-## Essential Commands
-
-### Backend
-
-```bash
-go run ./cmd/memos --port 8081    # Start dev server
-go test ./...                      # Run all tests
-golangci-lint run                  # Lint
-goimports -w .                     # Format imports
-```
-
-### Frontend
-
-```bash
-cd web && pnpm install             # Install deps
-pnpm dev                           # Dev server (proxies to :8081)
-pnpm lint                          # Type check + Biome lint
-pnpm lint:fix                      # Auto-fix lint issues
-pnpm format                        # Format code
-pnpm build                         # Production build
-```
-
-### Protocol Buffers
-
-```bash
-cd proto && buf generate            # Regenerate Go + TypeScript
-cd proto && buf lint                # Lint proto files
-```
-
-## Key Rules
-
-- **Go errors:** Use `errors.Wrap(err, "context")` from `github.com/pkg/errors`. Never use `fmt.Errorf`.
-- **Go imports:** stdlib → third-party → local (`github.com/usememos/memos`). Run `goimports -w .`.
-- **Go comments:** All exported functions must have doc comments (godot enforced).
-- **Go gRPC errors:** Return `status.Errorf(codes.X, "message")` from service methods.
-- **Frontend imports:** Use `@/` alias for absolute imports.
-- **Frontend formatting:** Biome — 140 char lines, double quotes, always semicolons, 2-space indent.
-- **Frontend state:** Server data via React Query hooks (`web/src/hooks/`). Client state via React Context.
-- **Database changes:** Must provide migration files for all 3 drivers (sqlite, mysql, postgres) and update `LATEST.sql`.
-- **Proto changes:** Run `buf generate` after editing `.proto` files. Generated code is in `proto/gen/` and `web/src/types/proto/`.
-- **Public endpoints:** Add to `server/router/api/v1/acl_config.go`.
+See `AGENTS.md` for full architecture, workflows, conventions, and patterns.