feat(v5.2.0): finalize Infrastructure & Polish (tests isolation, xdist, lint, CI)

tests/conftest.py: mutate the settings singleton (instead of rebinding) so DB + backup dir are isolated per test -> pytest-xdist safe.
Real backup tests (snapshot/prune/admin API) and OAuth mock tests (Gitea/GitHub/link) replace the previous skips.
init_db() now also creates webhook_subscriptions (full schema without the FastAPI lifespan).
ruff check is clean; .eslintrc.json migrated to eslint.config.mjs (flat config).
CI: lint job (ruff + eslint), parallel tests (-n auto), run on every branch push.
VERSION 5.11.1.

app/routers/library.py

@@ -59,9 +59,12 @@ def _build_item(db_row: dict, uid: int = 1) -> dict:
     elif content_format == "file":
         icon = "📄"
         fn = title.lower()
-        if fn.endswith(".pdf"): icon = "📕"
-        elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-        elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+        if fn.endswith(".pdf"):
+            icon = "📕"
+        elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+            icon = "🖼️"
+        elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+            icon = "📜"
     else:
         icon = "📝"
 
@@ -332,7 +335,7 @@ async def library_private(
 @router.get("/local-workspace-children/{item_id:int}")
 async def library_local_workspace_children(item_id: int, request: Request):
     """Return children of a local workspace item for tree expansion."""
-    uid = _get_user_id(request)
+    _get_user_id(request)
     with get_conn() as conn:
         # Get the item to find its workspace
         item = conn.execute(
@@ -358,9 +361,12 @@ async def library_local_workspace_children(item_id: int, request: Request):
         icon = "📁" if is_folder else "📄"
         fn = name.lower()
         if not is_folder:
-            if fn.endswith(".pdf"): icon = "📕"
-            elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-            elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+            if fn.endswith(".pdf"):
+                icon = "📕"
+            elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+                icon = "🖼️"
+            elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+                icon = "📜"
 
         with get_conn() as conn:
             child_count = conn.execute(
@@ -468,9 +474,12 @@ async def library_local_workspace(
         icon = "📁" if is_folder else "📄"
         fn = name.lower()
         if not is_folder:
-            if fn.endswith(".pdf"): icon = "📕"
-            elif any(fn.endswith(e) for e in [".png",".jpg",".jpeg",".gif",".webp",".svg"]): icon = "🖼️"
-            elif any(fn.endswith(e) for e in [".py",".js",".ts",".go",".rs"]): icon = "📜"
+            if fn.endswith(".pdf"):
+                icon = "📕"
+            elif any(fn.endswith(e) for e in [".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"]):
+                icon = "🖼️"
+            elif any(fn.endswith(e) for e in [".py", ".js", ".ts", ".go", ".rs"]):
+                icon = "📜"
 
         # Check for children
         child_count = conn.execute(
@@ -505,10 +514,14 @@ async def library_local_workspace(
 
 
 def _format_size(size_bytes):
-    if not size_bytes: return ""
-    if size_bytes < 1024: return f"{size_bytes} B"
-    if size_bytes < 1048576: return f"{size_bytes/1024:.1f} KB"
-    if size_bytes < 1073741824: return f"{size_bytes/1048576:.1f} MB"
+    if not size_bytes:
+        return ""
+    if size_bytes < 1024:
+        return f"{size_bytes} B"
+    if size_bytes < 1048576:
+        return f"{size_bytes/1024:.1f} KB"
+    if size_bytes < 1073741824:
+        return f"{size_bytes/1048576:.1f} MB"
     return f"{size_bytes/1073741824:.1f} GB"