feat(ai): curated OpenRouter model picker for hybrid backend

Add OPENROUTER_ALLOWED_MODELS env var and GET /insights/openrouter/models
endpoint returning the curated list verbatim. Drop the live capability
precheck in hybrid mode — trust the operator's allowlist; bad ids surface
as a chat-call error.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ai/insight_generator.rs

@@ -2525,30 +2525,10 @@ Return ONLY the summary, nothing else."#,
 
         // 2. Verify chat model supports tool calling.
         //    - local: existing Ollama model availability + capability check.
-        //    - hybrid: query OpenRouter's /models for the chosen model.
+        //    - hybrid: trust the operator's curated allowlist
+        //      (OPENROUTER_ALLOWED_MODELS) — no live precheck. A bad model id
+        //      surfaces as a chat-call error on the next step.
         let has_vision = if is_hybrid {
-            let or_client = openrouter_client
-                .as_ref()
-                .expect("openrouter_client constructed when is_hybrid");
-            let caps = or_client
-                .model_capabilities(&or_client.primary_model)
-                .await
-                .map_err(|e| {
-                    anyhow::anyhow!(
-                        "OpenRouter capability lookup failed for '{}': {}",
-                        or_client.primary_model,
-                        e
-                    )
-                })?;
-            if !caps.has_tool_calling {
-                return Err(anyhow::anyhow!(
-                    "tool calling not supported by OpenRouter model '{}'",
-                    or_client.primary_model
-                ));
-            }
-            insight_cx
-                .span()
-                .set_attribute(KeyValue::new("model_has_tool_calling", true));
             // In hybrid mode the chat model never sees images directly — we
             // describe-then-inject, so `has_vision` drives only whether we
             // bother loading the image to describe it, which we always do.
@@ -2776,7 +2756,7 @@ Return ONLY the summary, nothing else."#,
             3. Use recall_facts_for_photo to load any previously stored knowledge about subjects in this photo.\n\
             4. Use recall_entities to look up known people, places, or things that appear in this photo.\n\
             5. When you identify people, places, events, or notable things in this photo: use store_entity to record them and store_fact to record key facts (relationships, roles, attributes). This builds a persistent memory for future insights.\n\
-            6. Only produce your final insight AFTER you have gathered context from at least 5-12 tool calls.\n\
+            6. Only produce your final insight AFTER you have gathered context from at least 5 tool calls.\n\
             7. If a tool returns no results, that is useful information — continue calling the remaining tools anyway.",
             cameron_id_note = cameron_id_note
         );