feat: add mcp tools and cli enhancement

CLI.md

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+# CLI Usage Guide
+
+## Interactive CLI (`cli.py`)
+
+Antarmuka terminal interaktif untuk Perplexity AI dengan multi-turn history, streaming, dan MCP tool integration.
+
+### Setup
+
+1. Clone repo dan install dependencies:
+   ```bash
+   git clone https://github.com/ardzz/perplexity-scrape.git
+   cd perplexity-scrape
+   pip install -r requirements.txt
+   ```
+
+2. Copy `.env.example` dan isi credential Perplexity:
+   ```bash
+   cp .env.example .env
+   # Edit .env dan isi PERPLEXITY_SESSION_TOKEN, dll
+   ```
+
+### Menjalankan CLI
+
+```bash
+# Mode default (claude46sonnetthinking)
+python3 cli.py
+
+# Pilih model spesifik
+python3 cli.py --model sonar-pro
+python3 cli.py --model claude46sonnetthinking
+
+# Dengan MCP tools (BurpSuite, dll)
+python3 cli.py --mcp ./mcp_tools.json
+
+# Load sesi sebelumnya
+python3 cli.py --load ~/.perplexity_cli/sessions/session_20240525.json
+
+# Mode incognito (tidak muncul di dashboard Perplexity)
+python3 cli.py --incognito
+
+# System prompt kustom
+python3 cli.py --system "Kamu adalah security researcher. Fokus ke vulnerability analysis."
+
+# Kombinasi lengkap
+python3 cli.py --model claude46sonnetthinking --mcp ./mcp_tools.json --incognito
+```
+
+### Slash Commands
+
+| Command | Fungsi |
+|---|---|
+| `/model <nama>` | Ganti model aktif |
+| `/models` | List semua model yang tersedia |
+| `/clear` | Hapus history percakapan sesi ini |
+| `/save [path]` | Simpan sesi ke file JSON |
+| `/load <path>` | Load sesi dari file JSON |
+| `/sessions` | List sesi tersimpan |
+| `/system <teks>` | Set system prompt |
+| `/system` | Tampilkan system prompt aktif |
+| `/mode <nama>` | Ganti mode: `copilot`, `search`, `reasoning`, `writing` |
+| `/focus <nama>` | Ganti fokus: `internet`, `academic`, `wolfram`, `youtube`, `reddit` |
+| `/incognito` | Toggle incognito mode |
+| `/tools` | List semua MCP tools yang terhubung |
+| `/tool <nama> [args]` | Panggil MCP tool secara manual |
+| `/mcp <config.json>` | Connect ke MCP servers dari config file |
+| `/history` | Tampilkan riwayat percakapan |
+| `/status` | Info sesi aktif |
+| `/help` | Bantuan |
+| `exit` / `quit` | Keluar |
+
+### MCP Tool Integration
+
+Buat file `mcp_tools.json` (lihat `mcp_tools.example.json`):
+
+```json
+{
+  "mcpServers": {
+    "burpsuite": {
+      "command": "python",
+      "args": ["/path/to/burpsuite-mcp/server.py"],
+      "env": {
+        "BURP_API_KEY": "your-key"
+      }
+    },
+    "filesystem": {
+      "command": "npx",
+      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/home/user"]
+    }
+  }
+}
+```
+
+Jalankan dengan MCP:
+```bash
+python3 cli.py --mcp ./mcp_tools.json
+```
+
+Saat ada tools terhubung, LLM bisa call tools dengan format:
+```
+TOOL_CALL: burpsuite.active_scan {"url": "https://target.com", "type": "xss"}
+```
+CLI akan otomatis mengeksekusi dan mengembalikan hasil ke konteks percakapan.
+
+Atau panggil manual:
+```
+/tool burpsuite.active_scan url=https://target.com type=xss
+```
+
+### Model yang Tersedia
+
+- `claude46sonnetthinking` (default)
+- `claude45sonnetthinking`
+- `claude37sonnetthinking`
+- `claude35sonnet`
+- `sonar-pro`
+- `sonar`
+- `sonar-reasoning-pro`
+- `sonar-reasoning`
+- `r1-1776`
+- `gpt-4o`
+- `o3-mini`
+- `gemini-2.0-flash`
+
+### Session Management
+
+Sesi disimpan otomatis di `~/.perplexity_cli/sessions/` saat keluar.
+
+List sesi:
+```bash
+# Via CLI
+/sessions
+
+# Atau langsung
+ls ~/.perplexity_cli/sessions/
+```
+
+Load sesi lama:
+```bash
+python3 cli.py --load ~/.perplexity_cli/sessions/session_20240525_143022.json
+```