Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/004_vector_extension.up.sql

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+-- Enable pgvector extension for RAG functionality
+CREATE EXTENSION IF NOT EXISTS vector;
+
+-- Create knowledge_base table for RAG
+CREATE TABLE IF NOT EXISTS knowledge_base (
+    id VARCHAR(255) PRIMARY KEY,
+    tenant_id VARCHAR(255) NOT NULL,
+    title VARCHAR(500),
+    content TEXT NOT NULL,
+    embedding vector(1536), -- OpenAI ada-002 dimension, adjust as needed
+    metadata JSONB,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    INDEX idx_tenant (tenant_id)
+);
+
+-- Create index for vector similarity search
+CREATE INDEX IF NOT EXISTS idx_knowledge_embedding ON knowledge_base 
+USING ivfflat (embedding vector_cosine_ops)
+WITH (lists = 100);
+