Add import fallbacks for running server directly

Relative imports fail when running `python backend/main.py` directly
instead of `python -m backend.main`. Added try/except fallbacks for:
- code, research, command module imports
- defaultnames import
- jupyter_handler import in utils.py

TODO: Consider a cleaner solution like adding backend/ to sys.path
at startup, or always requiring module-style execution.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/main.py

@@ -38,7 +38,10 @@ PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 # For code execution
 try:
     from e2b_code_interpreter import Sandbox
-    from .code import stream_code_execution
+    try:
+        from .code import stream_code_execution
+    except ImportError:
+        from code import stream_code_execution
     from openai import OpenAI
     E2B_AVAILABLE = True
 except ImportError:
@@ -47,7 +50,10 @@ except ImportError:
 
 # For research
 try:
-    from .research import stream_research
+    try:
+        from .research import stream_research
+    except ImportError:
+        from research import stream_research
     RESEARCH_AVAILABLE = True
 except ImportError as e:
     RESEARCH_AVAILABLE = False
@@ -55,7 +61,10 @@ except ImportError as e:
 
 # For command center with tool-based launching
 try:
-    from .command import stream_command_center
+    try:
+        from .command import stream_command_center
+    except ImportError:
+        from command import stream_command_center
     COMMAND_AVAILABLE = True
 except ImportError:
     COMMAND_AVAILABLE = False
@@ -1042,7 +1051,10 @@ async def api_random_session_name():
     This gives equal weight to all elements regardless of isotope count.
     """
     import random
-    from .defaultnames import ISOTOPES
+    try:
+        from .defaultnames import ISOTOPES
+    except ImportError:
+        from defaultnames import ISOTOPES
     # Two-stage sampling: first pick element, then pick isotope
     element = random.choice(list(ISOTOPES.keys()))
     mass_number = random.choice(ISOTOPES[element])

backend/utils.py

@@ -8,7 +8,10 @@ from huggingface_hub import InferenceClient
 from e2b_code_interpreter import Sandbox
 from transformers import AutoTokenizer
 from traitlets.config import Config
-from jupyter_handler import JupyterNotebook
+try:
+    from .jupyter_handler import JupyterNotebook
+except ImportError:
+    from jupyter_handler import JupyterNotebook
 
 logger = logging.getLogger(__name__)