refactor(arch): modular package structure — split monolithic app.py into config/db/auth/memory/search/rag/gpu + routers/

- config.py: all constants, env vars, limits, skill registry, profiles
- db.py: schema init, connection factory, skill state helpers
- security.py: PIN hashing, audit logging, rate limiting, CSRF, request helpers
- auth.py: session management, PIN verify, auth routes
- memory.py: FTS5 CRUD + remember/forget command processing
- search.py: SearXNG integration, perplexity scoring, refusal/hedge detection
- gpu.py: rocm-smi stats
- rag.py: Qdrant vector search + system prompt assembly
- routers/: conversations, memories, models, presets, profile, settings, skills, chat, search
- app.py: slim entry point, middleware, router registration only

Bumps to v1.9.0

gpu.py

@@ -0,0 +1,31 @@
+"""
+JarvisChat - AMD GPU stats via rocm-smi.
+"""
+import json
+import logging
+import subprocess
+
+log = logging.getLogger("jarvischat")
+
+
+def get_gpu_stats() -> dict:
+    try:
+        result = subprocess.run(
+            ["rocm-smi", "--showuse", "--showmemuse", "--json"],
+            capture_output=True, text=True, timeout=5,
+        )
+        if result.returncode == 0:
+            data = json.loads(result.stdout)
+            gpu_info = data.get("card0", {})
+            gpu_use = gpu_info.get("GPU use (%)", 0)
+            vram_use = gpu_info.get("GPU Memory Allocated (VRAM%)", 0)
+            if isinstance(gpu_use, str):
+                gpu_use = int(gpu_use.replace("%", "").strip() or 0)
+            if isinstance(vram_use, str):
+                vram_use = int(vram_use.replace("%", "").strip() or 0)
+            return {"gpu_percent": gpu_use, "vram_percent": vram_use, "available": True}
+    except (subprocess.TimeoutExpired, FileNotFoundError, json.JSONDecodeError):
+        pass
+    except Exception as e:
+        log.warning(f"GPU stats error: {e}")
+    return {"gpu_percent": 0, "vram_percent": 0, "available": False}