perf: slim entries API + on-demand article loading for iOS Reader

Server: add slim query param (default true) to entries list endpoint,
returning EntrySlimOut without content/full_content HTML — cuts payload
size dramatically for list views. Single entry endpoint still returns
full content.

iOS: ArticleView now fetches full entry content on demand when opened
instead of relying on list data. Shows loading indicator while fetching.
Mark-as-read is fire-and-forget to avoid blocking the view.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/reader/app/api/entries.py

@@ -47,13 +47,28 @@ class EntryOut(BaseModel):
         from_attributes = True
 
     @classmethod
-    def from_entry(cls, entry: Entry) -> "EntryOut":
-        # Use full_content if available, otherwise RSS content
-        best_content = entry.full_content if entry.full_content else entry.content
+    def from_entry(cls, entry: Entry, slim: bool = False) -> "EntryOut | EntrySlimOut":
         # Extract thumbnail from stored field, or from content
         thumb = entry.thumbnail
         if not thumb:
             thumb = cls._extract_thumbnail(entry.content or entry.full_content or "")
+
+        if slim:
+            return EntrySlimOut(
+                id=entry.id,
+                title=entry.title,
+                url=entry.url,
+                author=entry.author,
+                published_at=entry.published_at.isoformat() if entry.published_at else None,
+                status=entry.status,
+                starred=entry.starred,
+                reading_time=entry.reading_time,
+                thumbnail=thumb,
+                feed=FeedRef(id=entry.feed.id, title=entry.feed.title) if entry.feed else None,
+            )
+
+        # Use full_content if available, otherwise RSS content
+        best_content = entry.full_content if entry.full_content else entry.content
         return cls(
             id=entry.id,
             title=entry.title,
@@ -85,9 +100,26 @@ class EntryOut(BaseModel):
         return None
 
 
+class EntrySlimOut(BaseModel):
+    """Entry without content fields — used for list views."""
+    id: int
+    title: str | None = None
+    url: str | None = None
+    author: str | None = None
+    published_at: str | None = None
+    status: str = "unread"
+    starred: bool = False
+    reading_time: int = 1
+    thumbnail: str | None = None
+    feed: FeedRef | None = None
+
+    class Config:
+        from_attributes = True
+
+
 class EntryListOut(BaseModel):
     total: int
-    entries: list[EntryOut]
+    entries: list[EntryOut | EntrySlimOut]
 
 
 class EntryBulkUpdate(BaseModel):
@@ -104,6 +136,7 @@ async def list_entries(
     starred: Optional[bool] = Query(None),
     feed_id: Optional[int] = Query(None),
     category_id: Optional[int] = Query(None),
+    slim: bool = Query(True),
     limit: int = Query(50, ge=1, le=500),
     offset: int = Query(0, ge=0),
     direction: str = Query("desc"),
@@ -149,7 +182,7 @@ async def list_entries(
 
     return EntryListOut(
         total=total,
-        entries=[EntryOut.from_entry(e) for e in entries],
+        entries=[EntryOut.from_entry(e, slim=slim) for e in entries],
     )