Added onboarding + release fixes (#433)

docs/release-sources-plugin-guide.md

@@ -43,7 +43,7 @@ The release sources system is built around two core interfaces:
 - **DownloadHandler**: Executes the actual download with progress reporting
 
 This separation allows:
-- Different search sources (Anna's Archive, Prowlarr, IRC, etc.)
+- Different search sources (Direct Download, Prowlarr, IRC, etc.)
 - Different download protocols (HTTP, torrent, usenet, etc.)
 - Shared queue and progress infrastructure
 
@@ -371,7 +371,7 @@ class Release:
     info_url: Optional[str] = None      # Link to tracker/info page
 
     protocol: Optional[str] = None   # "http", "torrent", "usenet"
-    indexer: Optional[str] = None    # Display name: "Anna's Archive", "MyAnonamouse"
+    indexer: Optional[str] = None    # Display name: "Direct Download", "My Indexer"
     seeders: Optional[int] = None    # For torrents
 
     extra: Dict = field(default_factory=dict)  # Source-specific metadata

docs/url-search-parameters.md

@@ -61,7 +61,7 @@ Some parameters support multiple values by repeating the parameter:
 
 ### Direct Download Mode (default)
 
-All parameters are used to filter results from Anna's Archive.
+All parameters are used to filter results from the direct download source.
 
 ### Universal Mode