feat: wire mobile app to real Timmy backend via JSON REST API (#73)

Add /api/chat, /api/upload, and /api/chat/history endpoints to the
FastAPI dashboard so the Expo mobile app talks directly to Timmy's
brain (Ollama) instead of a non-existent Node.js server.

Backend:
- New src/dashboard/routes/chat_api.py with 4 endpoints
- Mount /uploads/ for serving chat attachments
- Same context injection and session management as HTMX chat

Mobile app fixes:
- Point API base URL at port 8000 (FastAPI) instead of 3000
- Create lib/_core/theme.ts (was referenced but never created)
- Fix shared/types.ts (remove broken drizzle/errors re-exports)
- Remove broken server/chat.ts and 1,235-line template README
- Clean package.json (remove express, mysql2, drizzle, tRPC deps)
- Remove debug console.log from theme-provider

Tests: 13 new tests covering all API endpoints (all passing).

https://claude.ai/code/session_01XqErDoh2rVsPY8oTj21Lz2

Co-authored-by: Claude <noreply@anthropic.com>

mobile-app/lib/_core/theme.ts

@@ -0,0 +1,56 @@
+/**
+ * Core theme definitions — dark arcane palette matching the Timmy Time dashboard.
+ *
+ * All color tokens are defined here; constants/theme.ts re-exports them.
+ */
+
+export type ColorScheme = "light" | "dark";
+
+export interface ThemeColorPalette {
+  primary: string;
+  background: string;
+  surface: string;
+  foreground: string;
+  muted: string;
+  border: string;
+  success: string;
+  warning: string;
+  error: string;
+}
+
+/** Per-scheme flat color maps (used by NativeWind vars & ThemeProvider). */
+export const SchemeColors: Record<ColorScheme, ThemeColorPalette> = {
+  light: {
+    primary: "#a855f7",
+    background: "#080412",
+    surface: "#110820",
+    foreground: "#ede0ff",
+    muted: "#6b4a8a",
+    border: "#3b1a5c",
+    success: "#00e87a",
+    warning: "#ffb800",
+    error: "#ff4455",
+  },
+  dark: {
+    primary: "#a855f7",
+    background: "#080412",
+    surface: "#110820",
+    foreground: "#ede0ff",
+    muted: "#6b4a8a",
+    border: "#3b1a5c",
+    success: "#00e87a",
+    warning: "#ffb800",
+    error: "#ff4455",
+  },
+};
+
+/** Alias used by useColors() hook — keyed by scheme. */
+export const Colors = SchemeColors;
+
+export const ThemeColors = SchemeColors;
+
+export const Fonts = {
+  regular: { fontFamily: "System", fontWeight: "400" as const },
+  medium: { fontFamily: "System", fontWeight: "500" as const },
+  bold: { fontFamily: "System", fontWeight: "700" as const },
+};

mobile-app/lib/chat-store.tsx

@@ -71,16 +71,16 @@ const ChatContext = createContext<ChatContextValue | null>(null);
 // ── API call ────────────────────────────────────────────────────────────────
 
 function getApiBase(): string {
-  // Set EXPO_PUBLIC_API_BASE_URL in your .env to point to your Timmy backend
-  // e.g. EXPO_PUBLIC_API_BASE_URL=http://192.168.1.100:3000
+  // Set EXPO_PUBLIC_API_BASE_URL in your .env to point to your Timmy dashboard
+  // e.g. EXPO_PUBLIC_API_BASE_URL=http://192.168.1.100:8000
   const envBase = process.env.EXPO_PUBLIC_API_BASE_URL;
   if (envBase) return envBase.replace(/\/+$/, "");
-  // Fallback for web: derive from window location
+  // Fallback for web: derive from window location (same host, port 8000)
   if (typeof window !== "undefined" && window.location) {
-    return `${window.location.protocol}//${window.location.hostname}:3000`;
+    return `${window.location.protocol}//${window.location.hostname}:8000`;
   }
-  // Default: local machine
-  return "http://127.0.0.1:3000";
+  // Default: Timmy dashboard on localhost
+  return "http://127.0.0.1:8000";
 }
 
 const API_BASE = getApiBase();

mobile-app/lib/theme-provider.tsx

@@ -61,8 +61,6 @@ export function ThemeProvider({ children }: { children: React.ReactNode }) {
     }),
     [colorScheme, setColorScheme],
   );
-  console.log(value, themeVariables)
-
   return (
     <ThemeContext.Provider value={value}>
       <View style={[{ flex: 1 }, themeVariables]}>{children}</View>