feat(chat): integrate chat project into monorepo with full app structure

- Restructure chat as apps/mobile, apps/web, apps/landing, backend
- Add NestJS backend for secure Azure OpenAI API calls
- Remove exposed API key from mobile app (security fix)
- Add shared chat-types package
- Create SvelteKit web app scaffold
- Create Astro landing page scaffold
- Update pnpm workspace configuration
- Add project-level CLAUDE.md documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

chat/apps/mobile/scripts/spaces/create_spaces_tables.sql

@@ -0,0 +1,45 @@
+-- Create spaces table
+CREATE TABLE IF NOT EXISTS public.spaces (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name TEXT NOT NULL,
+  description TEXT,
+  owner_id UUID NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  is_archived BOOLEAN DEFAULT false
+);
+
+-- Add comments for documentation
+COMMENT ON TABLE public.spaces IS 'Collaborative spaces for organizing conversations';
+COMMENT ON COLUMN spaces.name IS 'Name of the space';
+COMMENT ON COLUMN spaces.description IS 'Optional description of the space';
+COMMENT ON COLUMN spaces.owner_id IS 'User ID of the space owner';
+COMMENT ON COLUMN spaces.is_archived IS 'Indicates whether the space is archived';
+
+-- Create space_members table with roles/permissions
+CREATE TABLE IF NOT EXISTS public.space_members (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  space_id UUID NOT NULL REFERENCES public.spaces(id) ON DELETE CASCADE,
+  user_id UUID NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
+  role TEXT NOT NULL CHECK (role IN ('owner', 'admin', 'member', 'viewer')),
+  invitation_status TEXT NOT NULL DEFAULT 'pending' CHECK (invitation_status IN ('pending', 'accepted', 'declined')),
+  invited_by UUID REFERENCES public.users(id),
+  invited_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  joined_at TIMESTAMP WITH TIME ZONE,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  UNIQUE(space_id, user_id)
+);
+
+-- Add comments for space_members
+COMMENT ON TABLE public.space_members IS 'Members of collaborative spaces with defined roles';
+COMMENT ON COLUMN space_members.role IS 'Role of the user in the space (owner, admin, member, viewer)';
+COMMENT ON COLUMN space_members.invitation_status IS 'Status of the invitation (pending, accepted, declined)';
+
+-- Modify conversations table to add space_id
+ALTER TABLE public.conversations 
+ADD COLUMN IF NOT EXISTS space_id UUID REFERENCES public.spaces(id) ON DELETE SET NULL;
+
+-- Create indexes for faster queries
+CREATE INDEX IF NOT EXISTS idx_conversations_space_id ON conversations(space_id);
+CREATE INDEX IF NOT EXISTS idx_conversations_space_user ON conversations(space_id, user_id);