Fix README.md merge conflicts and update documentation

[MasumRab]

Summary by Sourcery

Resolve README.md merge conflicts and comprehensively update the documentation to reflect the current project architecture, components, and developer usage.

Documentation:

• Resolve merge conflicts and remove outdated duplicate sections in README.md
• Reorganize README into clear sections: project architecture, Gradio UI structure, directory layout, data flow, launcher usage, prerequisites, and development notes
• Update architecture overview to describe the modular Python FastAPI/Gradio backend, node-based workflow engine, TypeScript microservice, React frontend, and configurable data storage
• Add detailed Gradio UI enhancements including a new email retrieval and filtering tab
• Simplify setup instructions by introducing launch.py flags and removing legacy PostgreSQL references

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[sourcery-ai]

Reviewer's Guide

This PR overhauls README.md by removing merge conflict artifacts, standardizing headings, and greatly expanding documentation to include detailed project architecture, Gradio UI specifications, updated directory and data flow diagrams, comprehensive usage and development guidelines, and replacement of PostgreSQL references with a configurable SQLite storage setup.

Flow diagram for updated email processing pipeline

flowchart TD
    Input["Input (Raw Emails, Files, API)"] --> Preprocessing["Preprocessing (Clean, Tokenize, Normalize)"]
    Preprocessing --> AIAnalysis["AI Analysis (Sentiment, Intent, Urgency, Topic)"]
    AIAnalysis --> Categorization["Categorization (Tags, Priority, Custom)"]
    Categorization --> Storage["Storage (JSON Files, Database)"]
    Categorization --> Cache["Cache (SQLite, Fast Access)"]
    Categorization --> Workflow["Workflow (Nodes, Chains, Custom)"]
    Categorization --> Output["Output (API, UI, Export)"]

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File-Level Changes

Change	Details	Files
Resolve merge conflicts and unify main headings	Removed Git conflict markers Standardized project title and section headings	README.md
Introduce comprehensive project architecture section	Describe Python backend, Node-based workflow engine, TypeScript backend, and React frontend	README.md
Expand Gradio UI documentation	Detail UI tabs, interface structure, and new email retrieval/filtering requirements	README.md
Revise directory layout and data flow diagrams	Update ASCII directory tree to match code organization Redraw email processing pipeline diagram	README.md
Enhance launcher usage and development guidelines	Add CLI flag examples for selective service startup Document virtual environment, dependencies, and modular design	README.md
Switch storage from PostgreSQL to SQLite	Remove PostgreSQL prerequisites and configuration instructions Add file-based SQLite storage with configurable data directory	README.md

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