fix: propagate alternative API provider settings to agent subprocesses

When users configured GLM/Ollama/Kimi via the Settings UI, agents still
used Claude because conflicting env vars leaked through subprocess env.

Root cause: get_effective_sdk_env() set ANTHROPIC_AUTH_TOKEN for GLM but
didn't clear ANTHROPIC_API_KEY, which leaked from os.environ. The CLI
prioritized the wrong credential.

Changes:
- registry.py: Clear conflicting auth vars (API_KEY vs AUTH_TOKEN) and
  Vertex AI vars when building env for alternative providers
- client.py: Replace manual os.getenv() loop with get_effective_sdk_env()
  so agent SDK reads provider settings from the database
- autonomous_agent_demo.py: Apply UI-configured provider settings to
  process env so CLI-launched agents also respect Settings UI config
- start.py: Pass --model from settings when launching agent subprocess
- server/schemas.py: Allow non-Claude model names when an alternative
  provider is configured (prevents 422 errors for glm-4.7, etc.)
- .env.example: Document env vars for GLM, Ollama, and Kimi providers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

autonomous_agent_demo.py

@@ -44,8 +44,10 @@ from dotenv import load_dotenv
 # IMPORTANT: Must be called BEFORE importing other modules that read env vars at load time
 load_dotenv()
 
+import os
+
 from agent import run_autonomous_agent
-from registry import DEFAULT_MODEL, get_project_path
+from registry import DEFAULT_MODEL, get_effective_sdk_env, get_project_path
 
 
 def parse_args() -> argparse.Namespace:
@@ -195,6 +197,14 @@ def main() -> None:
     # Note: Authentication is handled by start.bat/start.sh before this script runs.
     # The Claude SDK auto-detects credentials from ~/.claude/.credentials.json
 
+    # Apply UI-configured provider settings to this process's environment.
+    # This ensures CLI-launched agents respect Settings UI provider config (GLM, Ollama, etc.).
+    # Uses setdefault so explicit env vars / .env file take precedence.
+    sdk_overrides = get_effective_sdk_env()
+    for key, value in sdk_overrides.items():
+        if value:  # Only set non-empty values (empty values are used to clear conflicts)
+            os.environ.setdefault(key, value)
+
     # Handle deprecated --parallel flag
     if args.parallel is not None:
         print("WARNING: --parallel is deprecated. Use --concurrency instead.", flush=True)