Update V1 & V2 core documents and reorganize docs folder

docs/ver1/index_v1.md

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+## Document Transcription System Overview
+
+This project is a production application for transcribing and preserving historical family documents. It is intentionally designed for personal-scale use, with a simplicity-first architecture that is easy to operate and easy to extend.
+
+## Start Here
+
+Read [architecture_v1.md](architecture_v1.md) first.
+
+The architecture page is the primary technical reference and defines:
+
+- deployed topology and infrastructure limits
+- module boundaries and dependency flow
+- processing life cycle and data ownership
+- test strategy, risk controls, and extension path
+
+## What The Application Does
+
+At a high level, users upload images or PDFs as content sources for handwritten, typed, or typeset documents, run asynchronous transcription jobs, review optional revisions, and search across accepted text.
+
+### Core capabilities:
+
+- document grouping with one or more content sources and metadata capture
+- asynchronous transcription with visible job status
+- immutable original transcription persisted with each job (plus provider/model/prompt metadata)
+- transcription prompt management with one Markdown file per prompt for human refinement over time
+- optional revisions for user-authored edits of original immutable transcription text
+- full-text search over accepted transcripts
+- export of transcript data
+
+## Production Operating Model
+
+The system runs with minimal operational overhead:
+
+- PostgreSQL in a dedicated Docker container is considered extremely lightweight and simple for this system
+- MongoDB in a dedicated Docker container is also considered extremely lightweight and simple for document-centric persistence
+- a three-container deployment (app, PostgreSQL, MongoDB) is a simple and acceptable baseline
+- no required queue or search-engine containers in the baseline setup
+
+This operating model keeps deployment and maintenance simple while preserving clean boundaries for future scale.
+
+---
+
+## Documentation Map
+
+- System Overview (this document)
+- [System Design Intent](intent.md)
+- [Transcription Methodology](transcription_methodology.md)
+- [System Architecture](architecture_v1.md)
+- [System Requirements](requirements_v1.md)
+- [Data model](schema_v1.md)
+- [Error Handling Policy](error_handling_v1.md)
+- [Implementation Plan](implementation_plan_v1.md)
+
+## Glossary
+
+- Document-oriented persistence: Storing data as flexible records instead of fixed relational rows.
+- Prompt artifact: A single Markdown file that defines one transcription prompt and is edited independently.
+- System of record: The authoritative persistent store for canonical data.