[MatheusCastro99]

Closes #166.

Revises Docs/Project_Roadmap.md before the Auth epic starts:

• Small fixes first: secret scanning and push protection, the npm audit finding, customer pagination.
• A hosting and auth decision section with options A–C (no pick; to be recorded as an ADR by the owner).
• Auth split into Epic 2 (Authentication) and Epic 3 (Multiple users: ownership, per-user uniqueness, business profile, customer id on invoices, migration).
• Epic 4 Dockerization ends with a live staging environment; Epic 5 UI; Epic 6 go-live spelled out (hardening, operations, privacy, end-to-end tests).
• An open product question on sales tax rates; the Backlog: bugs found during epic work #153 deferred items kept.

Docs only. Epics are renumbered; no other Markdown file in the repo refers to the old numbers.

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