Add configuration files, database migrations, and authentication implementation scaffolding

deployments/db/init-master.sql

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+-- Master Database Schema
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+CREATE TABLE IF NOT EXISTS communities (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name TEXT NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    username TEXT UNIQUE NOT NULL,
+    display_name TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS webauthn_credentials (
+    id BYTEA PRIMARY KEY,
+    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
+    public_key BYTEA NOT NULL,
+    attestation_type TEXT NOT NULL,
+    aaguid UUID NOT NULL,
+    sign_count UINT32 NOT NULL DEFAULT 0,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS community_members (
+    community_id UUID REFERENCES communities(id) ON DELETE CASCADE,
+    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
+    role TEXT NOT NULL DEFAULT 'admin', -- 'owner', 'admin'
+    PRIMARY KEY (community_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS storage_nodes (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    community_id UUID REFERENCES communities(id) ON DELETE CASCADE,
+    address TEXT NOT NULL, -- Internal cluster address or URL
+    status TEXT DEFAULT 'active',
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);