HTTP Server and Entrypoint

[hayesZach]

Closes CSF-875

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Note

Medium Risk
Introduces a new main entrypoint and server wiring, including HTTP lifecycle management and repository initialization; startup/shutdown and dependency injection changes can affect availability and resource cleanup.

Overview
Adds a runnable HTTP service: a new main.go boots config/logging, starts an http.Server with timeouts, handles SIGTERM/SIGINT, and performs graceful shutdown including closing repositories.

Introduces a server.New built on chi (new dependency) that initializes private/public repositories, wires standard chi middleware, and injects a new repository.Factory into request context via FactoryMiddleware (with supporting test factory and middleware tests).

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[linear]

CSF-875 HTTP Server and Entrypoint