Rewrite Miniflux plugin to use requests, add filter and bookmark tools

Drop the miniflux pip client in favour of requests (already in the
container). Add update_feed_filters (keeplist/blocklist regex),
toggle_bookmark, get_entry (full content), and category filtering.
Remove the pip install step from Ansible.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infra/hermes/plugins/miniflux/__init__.py

@@ -14,3 +14,27 @@ def register(ctx):
         schema=schemas.GET_UNREAD_ENTRIES,
         handler=tools.get_unread_entries,
     )
+    ctx.register_tool(
+        name="get_entry",
+        toolset="miniflux",
+        schema=schemas.GET_ENTRY,
+        handler=tools.get_entry,
+    )
+    ctx.register_tool(
+        name="toggle_bookmark",
+        toolset="miniflux",
+        schema=schemas.TOGGLE_BOOKMARK,
+        handler=tools.toggle_bookmark,
+    )
+    ctx.register_tool(
+        name="update_feed_filters",
+        toolset="miniflux",
+        schema=schemas.UPDATE_FEED_FILTERS,
+        handler=tools.update_feed_filters,
+    )
+    ctx.register_tool(
+        name="mark_as_read",
+        toolset="miniflux",
+        schema=schemas.MARK_AS_READ,
+        handler=tools.mark_as_read,
+    )