fix: resolve CodeRabbit import style issues in main.py

- Add FallbackHashEmbeddings to existing relative import on line 46
- Remove redundant absolute imports in _get_fallback_embeddings function
- Use consistent relative import style throughout the file
- Simplify function by removing unnecessary import statements

This addresses CodeRabbit's feedback about:
- Redundant import of contextforge_memory.embeddings.base
- Inconsistent import style (absolute vs relative)
- Unnecessary complexity in _get_fallback_embeddings function

Author: AlmostBald-TRADING

src/contextforge_memory/main.py

@@ -43,7 +43,7 @@
 if TYPE_CHECKING:
     import numpy as np
 
-from .embeddings.base import EmbeddingsProvider
+from .embeddings.base import EmbeddingsProvider, FallbackHashEmbeddings
 from .ephemeral.session_store import SessionStore
 from .summarize.base import HeuristicSummarizer
 from .vector_index.in_memory_index import InMemoryCosineIndex
@@ -917,18 +917,14 @@ def get_provider_config() -> ProviderConfig:
 
 
 def _get_fallback_embeddings(dimension: int) -> EmbeddingsProvider:
-    """Get a FallbackHashEmbeddings instance with direct import.
+    """Get a FallbackHashEmbeddings instance.
 
     Args:
         dimension: The embedding dimension to use
 
     Returns:
         Initialized FallbackHashEmbeddings provider
     """
-    # Import the parent module first to ensure it's in sys.modules
-    import contextforge_memory.embeddings.base  # noqa: F401
-    from contextforge_memory.embeddings.base import FallbackHashEmbeddings
-
     return FallbackHashEmbeddings(dimension)