fix(devcontainer): prevent PORT env from leaking to Next.js

[jakehobbs]

Summary

• Remove export PORT from the Makefile so Next.js doesn't inherit the Go server's port and attempt to bind it, causing an address already in use crash on startup
• Use env -u PORT pnpm dev to explicitly strip PORT from the Next.js process (needed because Conductor injects PORT as a shell env var, which persists regardless of the Makefile export)
• Pass PORT=$(PORT) explicitly only to go run main.go
• Update conductor.json setup script to seed the dev database (make dev_db) and activist data (adb seed activists) after installing deps

Test plan

• Run setup in Conductor — devcontainer comes up, deps install, DB is seeded with dev user and activist data
• Run app in Conductor — Go server binds the workspace port, Next.js starts on 3000, no address already in use error

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5c83952b-1adb-453c-b0ac-d80d85fbe02c

📥 Commits

Reviewing files that changed from the base of the PR and between a35b299 and 201e163.

📒 Files selected for processing (2)

• Makefile
• conductor.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jakehobbs/port-already-in-use-fix

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