feat: Expand fleet to 23 skills across all domains

New skills (14):
- nestjs-best-practices: 40 priority-ranked rules (kadajett)
- fastapi: Pydantic v2, async SQLAlchemy, JWT auth (jezweb)
- architecture-patterns: Clean Architecture, Hexagonal, DDD (wshobson)
- python-performance-optimization: Profiling and optimization (wshobson)
- ai-sdk: Vercel AI SDK streaming and agent patterns (vercel)
- create-agent: Modular agent architecture with OpenRouter (openrouterteam)
- proactive-agent: WAL Protocol, compaction recovery, self-improvement (halthelobster)
- brand-guidelines: Brand identity enforcement (anthropics)
- ui-animation: Motion design with accessibility (mblode)
- marketing-ideas: 139 ideas across 14 categories (coreyhaines31)
- pricing-strategy: SaaS pricing and tier design (coreyhaines31)
- programmatic-seo: SEO at scale with playbooks (coreyhaines31)
- competitor-alternatives: Comparison page architecture (coreyhaines31)
- referral-program: Referral and affiliate programs (coreyhaines31)

README reorganized by domain: Code Quality, Frontend, Backend,
Auth, AI/Agent Building, Marketing, Design, Meta.

Mosaic Stack is not limited to coding — the Orchestrator serves
coding, business, design, marketing, writing, logistics, and analysis.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

packages/mosaic/framework/skills/fastapi/templates/src/main.py

@@ -0,0 +1,62 @@
+"""FastAPI application entry point."""
+
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from src.config import settings
+from src.database import Base, engine
+
+# Import routers
+from src.auth.router import router as auth_router
+
+# Add more routers as needed:
+# from src.items.router import router as items_router
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Application lifespan handler for startup/shutdown."""
+    # Startup: Create database tables
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    yield
+    # Shutdown: Add cleanup here if needed
+
+
+app = FastAPI(
+    title=settings.APP_NAME,
+    lifespan=lifespan,
+)
+
+# CORS middleware - configure for your frontend
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[
+        "http://localhost:3000",  # React dev server
+        "http://localhost:5173",  # Vite dev server
+    ],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include routers
+app.include_router(auth_router)
+# app.include_router(items_router)
+
+
+@app.get("/")
+async def root():
+    """Health check endpoint."""
+    return {"status": "ok", "app": settings.APP_NAME}
+
+
+@app.get("/health")
+async def health():
+    """Detailed health check."""
+    return {
+        "status": "healthy",
+        "database": "connected",
+    }