[Feature] Add installers for snippet-type MCP clients (Cline, Kiro, Windsurf, Cursor)

[KevinLi0w0]

Problem

Split from #32.

PR #57 shipped one-command installers for Gemini CLI, Goose, opencode, and Amp. However, 4 clients that have stable on-disk config files still only have manual config snippets in mcp-integration.md — users must manually find and edit the right JSON file. This is error-prone and inconsistent with the installer pattern already established for Codex, Claude Code, Gemini CLI, Goose, opencode, and Amp.

Proposed solution

Add hebb <client> install / hebb <client> uninstall commands for:

Client	Config file	Format
Cline	~/.cline/mcp.json (CLI) / VS Code global storage (IDE)	JSON, mcpServers
Kiro	.kiro/settings/mcp.json or ~/.kiro/settings/mcp.json	JSON, mcpServers
Windsurf	~/.codeium/windsurf/mcp_config.json	JSON, mcpServers
Cursor	~/.cursor/mcp.json or .cursor/mcp.json	JSON, mcpServers

Follow the pattern in src/hebb/integrations/gemini_cli/ (shared _json_config.py helpers). Each installer should:

• Resolve absolute hebb-mcp path via hebb_mcp_command()
• Be idempotent (re-running replaces prior hebb entry)
• Preserve unrelated config entries
• Use atomic writes (tempfile + os.replace)

Acceptance criteria:

• Each client has install and uninstall commands
• Unit tests covering install, idempotency, config preservation, and uninstall
• mcp-integration.md (EN + zh) updated to recommend installer as primary method
• S1 command-drift CI guard extended to cover new commands

Alternatives considered

Leave as manual snippets only. This works but creates an inconsistent experience — some clients have one-command install, others require manual JSON editing.