Fix import paths for reorganized services subpackage structure

[Copilot]

Code review identified that import paths weren't updated when services were reorganized into subpackages (memory, knowledge, tasks, code, utils, sql). Additionally, a syntax error in mcp/server.py prevented the file from compiling.

Export singleton instances from subpackages

• Updated __init__.py files to export both classes and singleton instances (memory_store, task_queue, graph_service, etc.)
• Enables cleaner imports: from codebase_rag.services.memory import memory_store instead of from codebase_rag.services.memory_store import memory_store

Update import paths across codebase

• API routes (6 files): Use subpackage imports for all service dependencies
• Core modules: Updated lifespan.py and mcp/server.py
• Service internals: Changed memory_extractor.py to use relative import for memory_store

Fix syntax error in mcp/server.py

• Removed orphaned code incorrectly placed inside InitializationOptions() call in main() function
• Code from a different function was mixed into the initialization parameters

Example of new import pattern:

# Before
from codebase_rag.services.task_queue import task_queue, TaskStatus
from codebase_rag.services.task_storage import TaskType
from codebase_rag.services.task_processors import processor_registry

# After
from codebase_rag.services.tasks import task_queue, TaskStatus, TaskType, processor_registry

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