Add test script for manual JSON parser with LLM currency conversion

- Implemented a new test script `test_parser.py` to validate the functionality of the manual JSON parser.
- The script loads investor data from a CSV file and processes a sample of three investors.
- Results include detailed information about each investor, their funds, team members, and investment thesis.
- Added error handling for missing API key in the environment variables.

app/db/models.py

@@ -83,9 +83,7 @@ class InvestorTable(Base, TimestampMixin):
     headquarters = Column(String, nullable=True)
 
     # AUM fields
-    aum = Column(
-        String, nullable=True
-    )  # Store as string to preserve currency (e.g., "EUR 850,000,000")
+    aum = Column(Integer, nullable=True)  # Store as integer for numerical filtering
     aum_as_of_date = Column(String, nullable=True)
     aum_source_url = Column(String, nullable=True)