Add support for nullable API keys and LM Studio

nanobot/config/schema.py

@@ -96,7 +96,7 @@ class AgentsConfig(Base):
 class ProviderConfig(Base):
     """LLM provider configuration."""
 
-    api_key: str = ""
+    api_key: str | None = None
     api_base: str | None = None
     extra_headers: dict[str, str] | None = None  # Custom headers (e.g. APP-Code for AiHubMix)
 
@@ -115,6 +115,7 @@ class ProvidersConfig(Base):
     dashscope: ProviderConfig = Field(default_factory=ProviderConfig)
     vllm: ProviderConfig = Field(default_factory=ProviderConfig)
     ollama: ProviderConfig = Field(default_factory=ProviderConfig)  # Ollama local models
+    lm_studio: ProviderConfig = Field(default_factory=ProviderConfig)  # LM Studio local models
     ovms: ProviderConfig = Field(default_factory=ProviderConfig)  # OpenVINO Model Server (OVMS)
     gemini: ProviderConfig = Field(default_factory=ProviderConfig)
     moonshot: ProviderConfig = Field(default_factory=ProviderConfig)

nanobot/providers/registry.py

@@ -337,6 +337,17 @@ PROVIDERS: tuple[ProviderSpec, ...] = (
         detect_by_base_keyword="11434",
         default_api_base="http://localhost:11434/v1",
     ),
+    # LM Studio (local, OpenAI-compatible)
+    ProviderSpec(
+        name="lm_studio",
+        keywords=("lm-studio", "lmstudio", "lm_studio"),
+        env_key="LM_STUDIO_API_KEY",
+        display_name="LM Studio",
+        backend="openai_compat",
+        is_local=True,
+        detect_by_base_keyword="1234",
+        default_api_base="http://localhost:1234/v1",
+    ),
     # === OpenVINO Model Server (direct, local, OpenAI-compatible at /v3) ===
     ProviderSpec(
         name="ovms",