Add canonical name-based general icons

- 이후 리뉴얼 때 큰 카드로 사용

README.md

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+# Shared image repository
+
+`icons/` is served as `/image/icons/`. General portraits follow these rules:
+
+- `icons/장수/<장수명>.<확장자>` is the canonical shared path.
+- Scenario-specific collections keep a separate directory such as
+  `icons/걸그룹/` or `icons/롤시나리오/`.
+- Root-level numeric files such as `icons/1047.jpg` are compatibility aliases
+  for deployed legacy versions. Do not delete or replace them while those
+  versions are in service.
+- A general name must map to one canonical file. If two records intentionally
+  need different portraits, disambiguate the scenario name or use an explicit
+  scenario-specific path.
+
+The core2026 repository owns `resources/general-icons.json` and
+`tools/manage-general-icons.mjs`. Use that tool with this repository as
+`--image-root` to synchronize aliases, scenario paths, and verify that every
+catalog source exists and has identical bytes.