Rip out Ollama: direct_route only, no LLM layer

Pete moves to a remote host without Ollama access. Every source must
declare a direct_route channel; the classifier, explainer, semantic
dedup, !explain summaries, feed_hint, and the recent_headlines /
classification_log tables are gone. Deterministic dedup (canonical URL,
headline_norm, per-channel cooldown) remains.

internal/ingestion/parser.go

@@ -16,7 +16,7 @@ const userAgent = "Pete/1.0 (newsbot; +https://github.com/reala-misaki/pete)"
 
 var feedClient = &http.Client{Timeout: 30 * time.Second}
 
-// FeedItem represents a parsed RSS item ready for classification.
+// FeedItem represents a parsed RSS item ready for routing.
 type FeedItem struct {
 	GUID        string
 	Headline    string
@@ -24,9 +24,7 @@ type FeedItem struct {
 	ImageURL    string
 	ArticleURL  string
 	Source      string
-	FeedHint    string
-	Tier        int
-	DirectRoute *string
+	DirectRoute string
 }
 
 var (