feat: Add agents and agents settings

sources/agents/ollama_base_chat.toml

@@ -0,0 +1,44 @@
+schema_version = 1
+
+name        = "Ollama Base Chat"
+description = "Shared base for Ollama /api/chat profiles."
+
+abstract = true
+
+provider_instance = "Ollama (Native)"
+endpoint          = "/api/chat"
+
+tags = ["ollama", "local"]
+
+[template]
+message_format = """
+{
+  "messages": [
+    {%- if existsIn(ctx, "system_prompt") %}
+    {
+      "role": "system",
+      "content": {{ tojson(ctx.system_prompt) }}
+    }{% if length(ctx.history) > 0 %},{% endif %}
+    {%- endif %}
+    {%- for msg in ctx.history %}
+    {
+      "role": {{ tojson(msg.role) }},
+      "content": {{ tojson(msg.content) }}{% if existsIn(msg, "images") %},
+      "images": [
+        {%- for img in msg.images %}
+        {{ tojson(img.data) }}{% if not loop.is_last %},{% endif %}
+        {%- endfor %}
+      ]{% endif %}
+    }{% if not loop.is_last %},{% endif %}
+    {%- endfor %}
+  ]
+}
+"""
+
+[template.sampling]
+stream = true
+
+[template.sampling.options]
+num_predict = 2048
+temperature = 0.7
+keep_alive  = "5m"