Secure DB config + Parameterized SQL + Unified schema (env-based)

[anmolecule94]

This PR addresses security and reliability issues around DB configuration and SQL usage.

Changes:

Move DB config to env variables via software/db_config.py (dotenv support). Add .env.example for contributors. Parameterize SQL queries in software/manage_data.py; eliminate string interpolation. Ensure DB selection via DB_NAME; main and manage_data now CREATE/USE configured DB. Align software/report.py with shared schema (tables user/finance) and use db_config. Why:

Prevent hardcoded credentials and inconsistent schemas. Eliminate SQL injection risks. Make local setup reproducible and safer. Testing:

Ran through login/insert/delete paths with a local MySQL; verified tables are created in DB_NAME and queries succeed. Follow-ups:

Consider parameterizing remaining queries in software/main.py UI if any remain in other branches. Optionally add unit tests for encrypt/decrypt and DB helpers.

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