feat: Graphify integration — tenant codebase graph + support AI augmentation

- src/lib/graphify.ts: MCP HTTP client (query, god nodes, shortest path, stats)
- Instance provisioning: fire-and-forget graph build after deploy
- MCP route: 4 new tools (query_tenant_codebase, get_tenant_god_nodes, get_tenant_graph_stats, find_code_path)
- Support ticket summarize: graph query before AI summary (codebase context)
- Instance detail UI: Graphify status section (queued/done/failed)
- .env: GRAPHIFY_URL + GRAPHIFY_API_KEY (commented, opt-in)

.env

@@ -84,3 +84,12 @@ INSTANCE_GIT_BRANCH=main
 INSTANCE_DEMO_DAYS=14
 # Grace period after demo expiry or subscription cancellation (days)
 INSTANCE_GRACE_DAYS=7
+
+# ── Graphify (tenant codebase knowledge graph) ──
+# Graphify MCP HTTP service (Docker container). When configured, new tenant
+# instances trigger a background graph build, and the support ticket AI
+# queries the codebase before generating a summary.
+# Run: docker run -p 8080:8080 -v ./data/graphify:/data graphify serve
+#      --transport http --host 0.0.0.0 --api-key <secret>
+# GRAPHIFY_URL=http://localhost:8080
+# GRAPHIFY_API_KEY=your-graphify-api-key