feat: add Gemini-powered birdseye rendering

tests/test_setup_keys.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from civilplan_mcp import setup_keys
+
+
+def test_main_prompts_and_saves_gemini_api_key(monkeypatch, tmp_path: Path) -> None:
+    prompted_values = iter(["data-key", "vworld-key", "gemini-key"])
+    saved_payload: dict[str, str] = {}
+
+    monkeypatch.setattr(setup_keys, "_prompt_value", lambda name, current="": next(prompted_values))
+    monkeypatch.setattr(
+        setup_keys,
+        "save_api_keys",
+        lambda payload: saved_payload.update(payload) or tmp_path / "api-keys.dpapi.json",
+    )
+
+    exit_code = setup_keys.main([])
+
+    assert exit_code == 0
+    assert saved_payload == {
+        "DATA_GO_KR_API_KEY": "data-key",
+        "VWORLD_API_KEY": "vworld-key",
+        "GEMINI_API_KEY": "gemini-key",
+    }