chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

backend/app/schemas/common.py

@@ -0,0 +1,161 @@
+from datetime import date, datetime
+
+from pydantic import BaseModel, EmailStr, Field
+
+
+class Message(BaseModel):
+    message: str
+
+
+class SetupStatus(BaseModel):
+    needs_setup: bool
+    instance: dict | None = None
+
+
+class SetupCreate(BaseModel):
+    name: str = Field(min_length=1, max_length=160)
+    email: EmailStr
+    password: str = Field(min_length=12, max_length=256)
+    language: str
+    theme: str
+    public_url: str = Field(min_length=1, max_length=500)
+    instance_name: str = Field(min_length=1, max_length=160)
+    timezone: str = Field(min_length=1, max_length=80)
+
+
+class LoginRequest(BaseModel):
+    email: EmailStr
+    password: str = Field(min_length=1, max_length=256)
+
+
+class UserOut(BaseModel):
+    id: str
+    email: EmailStr
+    name: str
+    instance_role: str
+    language: str
+    theme: str
+    timezone: str
+    is_active: bool
+    onboarding_completed: bool
+
+    model_config = {"from_attributes": True}
+
+
+class UserCreate(BaseModel):
+    email: EmailStr
+    name: str = Field(min_length=1, max_length=160)
+    role: str = "user"
+    send_invite: bool = True
+
+
+class UserUpdate(BaseModel):
+    name: str | None = Field(default=None, min_length=1, max_length=160)
+    language: str | None = None
+    theme: str | None = None
+    timezone: str | None = None
+    instance_role: str | None = None
+    is_active: bool | None = None
+    onboarding_completed: bool | None = None
+
+
+class InviteAccept(BaseModel):
+    token: str
+    name: str = Field(min_length=1, max_length=160)
+    password: str = Field(min_length=12, max_length=256)
+    language: str
+    theme: str
+    home_name: str | None = Field(default=None, max_length=160)
+    join_code: str | None = Field(default=None, max_length=40)
+
+
+class HomeOut(BaseModel):
+    id: str
+    name: str
+    expiry_warning_days: int
+    daily_summary_enabled: bool
+    daily_summary_time: str
+    role: str | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class HomeCreate(BaseModel):
+    name: str = Field(min_length=1, max_length=160)
+
+
+class HomeSettingsUpdate(BaseModel):
+    name: str | None = Field(default=None, min_length=1, max_length=160)
+    expiry_warning_days: int | None = Field(default=None, ge=0, le=60)
+    daily_summary_enabled: bool | None = None
+    daily_summary_time: str | None = Field(default=None, pattern=r"^\d{2}:\d{2}$")
+
+
+class JoinCodeOut(BaseModel):
+    join_code: str
+    expires_at: datetime
+
+
+class ProductIn(BaseModel):
+    name: str = Field(min_length=1, max_length=220)
+    barcode: str | None = Field(default=None, max_length=80)
+    brand: str | None = Field(default=None, max_length=160)
+    category: str = Field(default="Other", max_length=120)
+    location: str = Field(default="Pantry", max_length=120)
+    quantity: float = Field(default=1, ge=0)
+    unit: str = Field(default="pcs", max_length=32)
+    expires_at: date | None = None
+    min_quantity: float = Field(default=0, ge=0)
+    notes: str | None = Field(default=None, max_length=5000)
+    image_url: str | None = Field(default=None, max_length=1000)
+
+
+class ProductOut(ProductIn):
+    id: str
+    home_id: str
+    status: str
+
+    model_config = {"from_attributes": True}
+
+
+class ShoppingItemIn(BaseModel):
+    name: str = Field(min_length=1, max_length=220)
+    category: str = Field(default="Other", max_length=120)
+    quantity: float = Field(default=1, ge=0)
+    unit: str = Field(default="pcs", max_length=32)
+    product_id: str | None = None
+
+
+class ShoppingItemOut(ShoppingItemIn):
+    id: str
+    home_id: str
+    checked: bool
+
+    model_config = {"from_attributes": True}
+
+
+class MailSettingsIn(BaseModel):
+    smtp_host: str | None = Field(default=None, max_length=220)
+    smtp_port: int = Field(default=587, ge=1, le=65535)
+    smtp_user: str | None = Field(default=None, max_length=220)
+    smtp_password: str | None = Field(default=None, max_length=1000)
+    use_tls: bool = True
+    use_starttls: bool = True
+    sender_address: EmailStr | None = None
+    sender_name: str = Field(default="NexaPantry", max_length=160)
+
+
+class MailSettingsOut(BaseModel):
+    smtp_host: str | None
+    smtp_port: int
+    smtp_user: str | None
+    has_password: bool
+    use_tls: bool
+    use_starttls: bool
+    sender_address: EmailStr | None
+    sender_name: str
+
+
+class TestMailIn(BaseModel):
+    to: EmailStr
+