refactor: deduplicate DB connection and query execution logic

[sauravbhattacharya001]

Summary

Eliminates code duplication in the \�pp\ package:

Util.java

• Extracted a private \getConnection(dbName)\ method that both \getAppConnection()\ and \getAzialaConnection()\ now delegate to
• Removes ~12 duplicated lines of credential lookup + JDBC connection logic

Network.java

• Replaced 5 nearly-identical query execution blocks (~100 lines) with a data-driven approach:
  • \MeetingQuery\ descriptor class holds SQL, edge code, and thresholds
  • \�uildSql()\ generates SQL from a shared template with parameterized operators
  • \�ppendEdges()\ executes any query and appends results to the output buffer
• All 5 relationship types (friends, study groups, classmates, strangers, familiar strangers) now use the same execution path

What didn't change

• Same SQL queries (verified by expansion)
• Same output format
• Same security validations (path traversal, env var requirements)

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