feat: v0.0.1 - Groq provider, timezone, journal context, test connection, task logging

Added:
- Groq AI provider (free, fast with llama-3.3-70b-versatile)
- Timezone setting (22 timezones)
- Journal context: include previous journals (3/7/14/30 days)
- Test connection button for AI providers
- Per-provider settings (API key, model, base URL remembered)
- Detailed task logging (full prompts and responses)
- Tasks page with expandable details
- Progress modal with steps and AI output details

Fixed:
- Groq API endpoint (https://api.groq.com/openai/v1/chat/completions)
- Ollama baseUrl leaking to other providers
- Database schema references
- Proper Prisma migrations (data-safe)

Changed:
- Default AI: OpenAI → Groq
- Project renamed: TotalRecall → DearDiary
- Strict anti-hallucination prompt
- Docker uses prisma migrate deploy (non-destructive)

backend/src/services/ai/groq.ts

@@ -0,0 +1,66 @@
+import type { AIProvider, AIProviderConfig } from './provider';
+
+export class GroqProvider implements AIProvider {
+  provider = 'groq' as const;
+  private apiKey: string;
+  private model: string;
+  private baseUrl: string;
+
+  constructor(config: AIProviderConfig) {
+    this.apiKey = config.apiKey;
+    this.model = config.model || 'llama-3.3-70b-versatile';
+    this.baseUrl = config.baseUrl || 'https://api.groq.com/openai/v1';
+  }
+
+  async generate(prompt: string, systemPrompt?: string): Promise<string> {
+    const messages: Array<{ role: string; content: string }> = [];
+    
+    if (systemPrompt) {
+      messages.push({ role: 'system', content: systemPrompt });
+    }
+    
+    messages.push({ role: 'user', content: prompt });
+
+    const response = await fetch(`${this.baseUrl}/chat/completions`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${this.apiKey}`,
+      },
+      body: JSON.stringify({
+        model: this.model,
+        messages,
+        temperature: 0.7,
+        max_tokens: 2000,
+      }),
+    });
+
+    if (!response.ok) {
+      const error = await response.text();
+      throw new Error(`Groq API error: ${response.status} ${error}`);
+    }
+
+    const data = await response.json() as { choices: Array<{ message: { content: string } }> };
+    return data.choices[0]?.message?.content || '';
+  }
+
+  async validate(): Promise<boolean> {
+    try {
+      const response = await fetch(`${this.baseUrl}/chat/completions`, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': `Bearer ${this.apiKey}`,
+        },
+        body: JSON.stringify({
+          model: this.model,
+          messages: [{ role: 'user', content: 'test' }],
+          max_tokens: 5,
+        }),
+      });
+      return response.ok || response.status === 400;
+    } catch {
+      return false;
+    }
+  }
+}