Ajoute sauvegarde UI + explorateur arborescent et ajuste modales

README.md

@@ -141,6 +141,32 @@ You can set all  the following variables:
 * `HTTP_PROXY_READ_TIMEOUT`
   * when calling the `proxy` endpoint, the value of `HTTP_PROXY_READ_TIMEOUT` will be the connection read timeout in milliseconds
   * Default value: `10000` (10 seconds)
+* `PLANTUML_SAVE_DIR`
+  * Local directory used by the save/load API for storing diagrams.
+  * Default value: `data/saves`
+* `PLANTUML_SAVE_MAX_SIZE`
+  * Maximum payload size (in bytes) accepted by the save endpoint.
+  * Default value: `200000`
+* `PLANTUML_SAVE_TOKEN`
+  * Optional shared token to protect the save/load/delete endpoints. If set, requests must provide the header `X-PlantUML-Token`.
+  * Default value: `null` (no auth)
+
+
+## Save / Load API
+
+The UI exposes “Save” and “Load” buttons to persist PlantUML sources on the server.
+
+- Endpoints (JSON):
+  - `POST /api/diagrams` with `{ "id": "my-diagram", "name": "optional name", "uml": "@startuml..." }`
+  - `GET /api/diagrams/{id}` returns the stored diagram
+  - `GET /api/diagrams` returns a lightweight list of stored diagrams
+  - `DELETE /api/diagrams/{id}` deletes a stored diagram
+- Storage:
+  - Files are written to `PLANTUML_SAVE_DIR` (default `data/saves`). You can structure ids with folders, e.g. `teamA/sequence1`.
+  - Max payload is limited by `PLANTUML_SAVE_MAX_SIZE` (default 200 KB).
+  - Optional protection: set `PLANTUML_SAVE_TOKEN` and pass `X-PlantUML-Token` header when calling the API.
+
+When hosting publicly, enable a token (or protect via reverse proxy) so user saves are not world-writeable.
 
 
 ## Alternate: How to build your docker image