feat: Add profitability calculation schemas and service functions

- Introduced Pydantic schemas for profitability calculations in `schemas/calculations.py`.
- Implemented service functions for profitability calculations in `services/calculations.py`.
- Added new exception class `ProfitabilityValidationError` for handling validation errors.
- Created repositories for managing project and scenario profitability snapshots.
- Developed a utility script for verifying authenticated routes.
- Added a new HTML template for the profitability calculator interface.
- Implemented a script to fix user ID sequence in the database.

scripts/apply_users_sequence_fix.py

@@ -0,0 +1,15 @@
+from sqlalchemy import create_engine, text
+from config.database import DATABASE_URL
+
+engine = create_engine(DATABASE_URL, future=True)
+sqls = [
+    "CREATE SEQUENCE IF NOT EXISTS users_id_seq;",
+    "ALTER TABLE users ALTER COLUMN id SET DEFAULT nextval('users_id_seq');",
+    "SELECT setval('users_id_seq', COALESCE((SELECT MAX(id) FROM users), 1));",
+    "ALTER SEQUENCE users_id_seq OWNED BY users.id;",
+]
+with engine.begin() as conn:
+    for s in sqls:
+        print('EXECUTING:', s)
+        conn.execute(text(s))
+print('SEQUENCE fix applied')