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/routes/campaigns.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;

server/routes/characters.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;

server/routes/notes.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;

server/routes/npcs.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;

server/routes/tables.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;

server/routes/threads.js

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+const express = require('express');
+const router = express.Router();
+
+module.exports = router;