sciagent code + Gitea Actions CI/CD

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/FIX_CHAT_ERROR.md

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+# Fix Chat Assistant 500 Error
+
+## Issue
+Getting 500 Internal Server Error when calling `/api/v1/chat` endpoint.
+
+## Root Causes
+
+1. **Model Name Mismatch** ✅ FIXED
+   - Code was using `gemma3:27b` but entrypoint pulls `gemma3:270M`
+   - **Fixed**: Updated code to use `gemma3:270M`
+
+2. **Ollama Not Running**
+   - Ollama service might not be started in the container
+   - Network connectivity issues
+
+3. **Model Not Available**
+   - Model might not be pulled yet
+   - Model name incorrect
+
+## Solutions
+
+### Solution 1: Restart the Container
+
+```bash
+# Stop and restart the backend container
+docker-compose down
+docker-compose up -d be0
+
+# Wait for Ollama to start (check logs)
+docker-compose logs -f be0
+```
+
+### Solution 2: Check Ollama Status
+
+```bash
+# Check if container is running
+docker ps | grep be0
+
+# Check Ollama inside container
+docker exec be0 ollama list
+
+# If Ollama is not running, start it
+docker exec be0 ollama serve &
+```
+
+### Solution 3: Pull the Model
+
+```bash
+# Pull the required model
+docker exec be0 ollama pull gemma3:270M
+
+# Verify it's available
+docker exec be0 ollama list | grep gemma3
+```
+
+### Solution 4: Test the Health Endpoint
+
+```bash
+# Check health endpoint (includes Ollama status)
+curl http://localhost:4402/health
+
+# Should show:
+# {
+#   "status": "healthy",
+#   "ollama": {
+#     "status": "connected",
+#     "available_models": ["gemma3:270M", ...]
+#   }
+# }
+```
+
+### Solution 5: Check Backend Logs
+
+```bash
+# View recent logs
+docker-compose logs be0 | tail -50
+
+# View ChatAssistant specific logs
+tail -f be0/logs/ChatAssistant.log
+```
+
+## Quick Fix Commands
+
+```bash
+# 1. Restart everything
+docker-compose restart be0
+
+# 2. Check Ollama
+docker exec be0 ollama list
+
+# 3. Test health
+curl http://localhost:4402/health
+
+# 4. Test chat endpoint
+curl -X POST http://localhost:4402/api/v1/chat \
+  -H "Content-Type: application/json" \
+  -d '{"message": "Hello"}'
+```
+
+## What Was Fixed
+
+1. ✅ Model name changed from `gemma3:27b` to `gemma3:270M`
+2. ✅ Added better error handling with specific error messages
+3. ✅ Added Ollama connection check on initialization
+4. ✅ Added health endpoint with Ollama status
+5. ✅ Improved logging for debugging
+
+## Expected Behavior After Fix
+
+1. Container starts and Ollama service runs
+2. Model `gemma3:270M` is available
+3. Health endpoint shows Ollama as "connected"
+4. Chat endpoint returns 200 with AI response
+
+## If Still Not Working
+
+1. **Check container logs:**
+   ```bash
+   docker-compose logs be0
+   ```
+
+2. **Check if Ollama is accessible:**
+   ```bash
+   docker exec be0 curl http://localhost:11434/api/tags
+   ```
+
+3. **Manually start Ollama:**
+   ```bash
+   docker exec -d be0 ollama serve
+   sleep 2
+   docker exec be0 ollama list
+   ```
+
+4. **Rebuild container:**
+   ```bash
+   docker-compose down
+   docker-compose build be0
+   docker-compose up be0
+   ```