fix(deps): add ollama and openai as explicit dependencies

agno's Ollama backend requires both the `ollama` and `openai` packages
(it uses the OpenAI-compatible wire format under the hood), but neither
was declared as a project dependency.

Ran a full import walk of all src modules in a fresh venv to confirm
zero missing imports after this change.

https://claude.ai/code/session_01W8jeKbHYNS75mPhGLYJxVq

pyproject.toml

@@ -11,6 +11,8 @@ requires-python = ">=3.11"
 license = { text = "MIT" }
 dependencies = [
     "agno[sqlite]>=1.4.0",
+    "ollama>=0.3.0",
+    "openai>=1.0.0",
     "fastapi>=0.115.0",
     "uvicorn[standard]>=0.32.0",
     "jinja2>=3.1.0",