Browse the file manager ("Dateien") as a filesystem

Many teachers never use topics or boards; their material sits in the
course's file area, and the tools answered "0 files" for courses holding
dozens of worksheets — 21 of 26 courses on the live account. Persönliche,
Kurs-, Team- and Geteilte Dateien live in the legacy file store, not in
files-storage, and its service is not in the public ingress. The only way in
is the legacy client: HTML listings, and GET /files/signedurl for a
pre-signed download.

core/legacy-files.ts turns that into one path tree — /my, /courses/<course>,
/teams/<team>, /shared — resolving names that contain "/", ids anywhere in a
path, and wrong or ambiguous names with a message saying what is there. A
listing that does not parse throws; it never reads as an empty folder.

Some of the legacy client's GET routes write (GET /files/share/ mints a
share token), so getFileManagerPage allows only the listing routes, by
pattern. Signed URLs are fetched with no credentials and must be https.

- MCP: fs_list, fs_tree, fs_find and fs_read; get_course lists course files.
- CLI: schulcloud fs ls, tree, find and get, recursive and resumable.
- API: /api/fs/list, tree, find and file.
- Index: the crawl walks the file manager (INDEX_FILE_MANAGER, on by
  default), so search covers the text inside those files and sync mirrors
  them under <course>/Kurs-Dateien.

The local instance gains a fixture for all four areas. It needed a loopback,
so signed URLs open from the host, and a pre-created bucket, since MinIO
does not implement PutBucketCors.

135 tests. Smoke 55/55 live; 57/57 and 55/55 on the local instance.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/config.ts

@@ -37,6 +37,8 @@ export interface Config {
 	mirrorMaxBytes: number;
 	/** Index personal files and submitted/returned work as well as course content. */
 	indexPersonalFiles: boolean;
+	/** Walk the file manager (Kurs-, Persönliche, Team- and Geteilte Dateien) when crawling. */
+	indexFileManager: boolean;
 	/** How often to re-crawl on a timer. Zero = only on demand. */
 	crawlIntervalMs: number;
 }
@@ -95,6 +97,9 @@ export function loadConfig(): Config {
 		// cost of a full crawl. Worth turning on to make your own handed-in work
 		// searchable, which no other route offers.
 		indexPersonalFiles: bool('INDEX_PERSONAL_FILES', false),
+		// On by default: many teachers keep their material only in Kurs-Dateien,
+		// so an index without it misses whole courses. One page load per folder.
+		indexFileManager: bool('INDEX_FILE_MANAGER', true),
 		crawlIntervalMs: intAllowingZero('CRAWL_INTERVAL_MS', 6 * 60 * 60_000),
 	};
 }