fix: double /v1 in embeddings URL + wrong auth header

Bug 1: LLM_API_BASE=https://api.riotpiao.com/v1 + code appends
/v1/embeddings = https://api.riotpiao.com/v1/v1/embeddings (404).
Fix: strip trailing /v1 from base URL in from_env().

Bug 2: embeddings client sent 'apikey' custom header, but gateway
expects 'Authorization: Bearer <token>'.
Fix: use Authorization Bearer header.

Caused: 'expected ident at line 1 column 2' error on /memory/query
(gateway returned HTML/text error, client tried to parse as JSON).

crates/mem-llm/src/embeddings.rs

@@ -64,9 +64,15 @@ impl EmbeddingsClient {
     /// - `LLM_API_BASE`: Gateway endpoint (default: https://api.riotpiao.com)
     /// - `LLM_API_KEY`: API key (optional)
     pub fn from_env() -> Result<Self> {
-        let base_url = env::var("LLM_API_BASE")
+        let mut base_url = env::var("LLM_API_BASE")
             .unwrap_or_else(|_| "https://api.riotpiao.com".to_string());
         
+        // Strip trailing /v1 to avoid double /v1/v1/embeddings
+        base_url = base_url.trim_end_matches('/').to_string();
+        if base_url.ends_with("/v1") {
+            base_url = base_url[..base_url.len() - 3].to_string();
+        }
+        
         let model = env::var("EMBEDDINGS_MODEL")
             .unwrap_or_else(|_| "nomic-ai/nomic-embed-text-v2-moe".to_string());
         
@@ -161,10 +167,9 @@ impl EmbeddingsClient {
         let url = format!("{}/v1/embeddings", self.base_url);
         let mut builder = self.http.post(&url);
 
-        // Send apikey header even though route currently doesn't require auth
-        // This future-proofs for when the route's auth plugin gets enabled
+        // Send as Bearer token (gateway expects Authorization: Bearer <key>)
         if !self.api_key.is_empty() {
-            builder = builder.header("apikey", &self.api_key);
+            builder = builder.header("Authorization", format!("Bearer {}", &self.api_key));
         }
 
         let resp = builder.json(&req).send().await?;
@@ -215,6 +220,28 @@ mod tests {
         assert_eq!(EMBEDDINGS_DIM, 768);
     }
 
+    #[test]
+    fn test_strip_trailing_v1() {
+        // Simulates LLM_API_BASE=https://api.riotpiao.com/v1
+        let mut base = "https://api.riotpiao.com/v1".to_string();
+        base = base.trim_end_matches('/').to_string();
+        if base.ends_with("/v1") {
+            base = base[..base.len() - 3].to_string();
+        }
+        assert_eq!(base, "https://api.riotpiao.com");
+        assert_eq!(format!("{}/v1/embeddings", base), "https://api.riotpiao.com/v1/embeddings");
+    }
+
+    #[test]
+    fn test_no_strip_when_no_v1() {
+        let mut base = "https://api.riotpiao.com".to_string();
+        base = base.trim_end_matches('/').to_string();
+        if base.ends_with("/v1") {
+            base = base[..base.len() - 3].to_string();
+        }
+        assert_eq!(base, "https://api.riotpiao.com");
+    }
+
     #[test]
     fn test_parse_real_embedding_response() {
         // Exact format returned by embeddings-predictor service