refactor(server): standardize server env config prefixes

[lan17]

Summary

• standardize server-owned config on canonical AGENT_CONTROL_* env vars
• remove legacy server env aliases and switch the database config to true env_prefix-based settings
• update server-facing compose, Docker, Makefile, and test docs to use the new canonical names

Verification

• uv run --package agent-control-server pytest server/tests/test_config.py server/tests/test_logging_utils.py --noconftest -q
• make lint
• make typecheck

Notes

• This PR intentionally migrates server env var names without legacy compatibility fallbacks.
• I did not run the full DB-backed make server-test suite in this environment.

[codecov]

Codecov Report

❌ Patch coverage is 97.64706% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
server/src/agent_control_server/logging_utils.py	94.73%	2 Missing ⚠️

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