feat: add topic tagging, semantic duplicate detection, and per-provider vision toggle

db/database.py

@@ -117,6 +117,7 @@ CREATE TABLE IF NOT EXISTS ai_providers (
     reasoning_effort VARCHAR(32) DEFAULT '',
     is_active BOOLEAN DEFAULT FALSE,
     fallback_provider_id BIGINT REFERENCES ai_providers(id) ON DELETE SET NULL,
+    supports_vision BOOLEAN DEFAULT FALSE,
     created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
 );
 
@@ -132,6 +133,7 @@ CREATE INDEX IF NOT EXISTS idx_ai_providers_active ON ai_providers(is_active);
 
 -- Migration safety for existing tables
 ALTER TABLE ai_providers ADD COLUMN IF NOT EXISTS fallback_provider_id BIGINT REFERENCES ai_providers(id) ON DELETE SET NULL;
+ALTER TABLE ai_providers ADD COLUMN IF NOT EXISTS supports_vision BOOLEAN DEFAULT FALSE;
 ALTER TABLE sources ADD COLUMN IF NOT EXISTS category_id INT REFERENCES channel_categories(id) ON DELETE SET NULL;
 ALTER TABLE targets ADD COLUMN IF NOT EXISTS category_id INT REFERENCES channel_categories(id) ON DELETE SET NULL;
 ALTER TABLE sources ADD COLUMN IF NOT EXISTS is_active BOOLEAN DEFAULT TRUE;