fix(db): resolve connection pool exhaustion and SSL stability issues

[aniebietafia]

• Increase pool_size and max_overflow to 20 to handle higher concurrent load
• Set pool_recycle to 300s to prevent 'SSL connection closed unexpectedly' errors from stale connections
• Add sslmode=require to connect_args for improved stability with managed Postgres
• Ensure pool_pre_ping is active to proactively discard dead connections

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ad09c3d7-f9e1-4bb5-962f-9bdaeb0a9808

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Reviewing files that changed from the base of the PR and between 7855fab and af56ea3.

📒 Files selected for processing (1)

• app/db/session.py

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