Initial extraction from fn_registry

sqlite_api: API REST HTTP read-only sobre registry.db y operations.db.
Bind por defecto 127.0.0.1:8484. Go + net/http + SQLite FTS5.

Extraido de fn_registry/projects/fn_monitoring/apps/sqlite_api/ como
repo independiente. La metadata del registry queda en project.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app.md

@@ -0,0 +1,59 @@
+---
+name: sqlite_api
+lang: go
+domain: infra
+description: "API REST HTTP read-only sobre registry.db y operations.db de cada app. Permite consultas SQL (solo SELECT/PRAGMA), busqueda FTS5, exploracion de tablas y schema. Bind por defecto a localhost:8484."
+tags: [service, api, sqlite, http, registry, fts5]
+uses_functions: []
+uses_types: []
+framework: "net/http"
+entry_point: "main.go"
+dir_path: "projects/fn_monitoring/apps/sqlite_api"
+---
+
+## Uso
+
+```bash
+# Arrancar (default: 127.0.0.1:8484)
+cd apps/sqlite_api && go run -tags fts5 .
+
+# Bind personalizado
+go run -tags fts5 . --bind 0.0.0.0:8484
+```
+
+## Endpoints
+
+| Metodo | Path | Descripcion |
+|--------|------|-------------|
+| GET | `/health` | Health check |
+| GET | `/api/databases` | Lista DBs disponibles (registry + ops:*) |
+| GET | `/api/databases/:db/tables` | Tablas y vistas de una DB |
+| GET | `/api/databases/:db/schema` | Schema SQL completo |
+| POST | `/api/databases/:db/query` | Ejecuta query SQL read-only |
+| GET | `/api/databases/:db/fts?q=...&table=...` | Busqueda FTS5 directa |
+
+## Seguridad
+
+- Solo queries SELECT, PRAGMA, WITH y EXPLAIN
+- SQLite abierto con `?mode=ro` (read-only a nivel driver)
+- Timeout de 5 segundos por query
+- Bind a localhost por defecto
+- CORS habilitado para acceso desde frontends
+
+## Bases de datos
+
+- `registry` — registry.db de la raiz
+- `ops:{app}` — operations.db de apps/{app}/ y projects/*/apps/{app}/
+
+Auto-descubre operations.db al arrancar escaneando apps/ y projects/*/apps/.
+
+## Health check
+
+```bash
+curl http://localhost:8484/health
+# {"status":"ok"}
+```
+
+## Puerto
+
+8484 (no colisiona con Metabase 3000, Jupyter 8888, deploy_server 9090).