init: Phase 1 project skeleton

Express entry point, SQLite schema init with seed data, static
frontend shell, and empty route/JS stubs per CLAUDE.md Phase 1 scope.

server/index.js

@@ -0,0 +1,31 @@
+const path = require('path');
+const express = require('express');
+require('./db');
+
+const campaignsRouter = require('./routes/campaigns');
+const charactersRouter = require('./routes/characters');
+const threadsRouter = require('./routes/threads');
+const npcsRouter = require('./routes/npcs');
+const notesRouter = require('./routes/notes');
+const tablesRouter = require('./routes/tables');
+
+const app = express();
+const PORT = 4000;
+
+app.use(express.json());
+app.use(express.static(path.join(__dirname, '..', 'public')));
+
+app.get('/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+app.use('/api/campaigns', campaignsRouter);
+app.use('/api/characters', charactersRouter);
+app.use('/api/threads', threadsRouter);
+app.use('/api/npcs', npcsRouter);
+app.use('/api/notes', notesRouter);
+app.use('/api/tables', tablesRouter);
+
+app.listen(PORT, () => {
+  console.log(`Mythic Oracle running at http://localhost:${PORT}`);
+});