feat: add exporter plugin architecture

scripts/exporter/__init__.py

@@ -0,0 +1,35 @@
+"""Exporter plugin discovery module.
+
+Auto-detects *_exporter.py files and exposes their exporters.
+Each exporter module must define an Exporter class inheriting BaseExporter.
+"""
+
+from __future__ import annotations
+
+import importlib
+import pkgutil
+from pathlib import Path
+
+from .base_exporter import BaseExporter
+
+_exporters: dict[str, type] = {}
+
+
+def discover_exporters() -> dict[str, type]:
+    """Auto-discover *_exporter.py modules, return {platform: ExporterClass}."""
+    if _exporters:
+        return _exporters
+
+    package_dir = Path(__file__).parent
+
+    for _finder, name, _ispkg in pkgutil.iter_modules([str(package_dir)]):
+        if not name.endswith("_exporter") or name == "base_exporter":
+            continue
+
+        module = importlib.import_module(f".{name}", package=__package__)
+        exporter_class = getattr(module, "Exporter", None)
+
+        if exporter_class and issubclass(exporter_class, BaseExporter):
+            _exporters[exporter_class.platform_name()] = exporter_class
+
+    return _exporters