Add Flask web UI, Docker Compose, core engine + tests

- physcom core: CLI, 5-pass pipeline, SQLite repo, 37 tests
- physcom_web: Flask app with HTMX for entity/domain/pipeline/results CRUD
- Docker Compose: web + cli services sharing a named volume for the DB
- Clean up local settings to use wildcard permissions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/physcom/llm/providers/mock.py

@@ -0,0 +1,28 @@
+"""Mock LLM provider for testing."""
+
+from __future__ import annotations
+
+from physcom.llm.base import LLMProvider
+
+
+class MockLLMProvider(LLMProvider):
+    """Returns deterministic stub responses for testing."""
+
+    def __init__(self, default_estimates: dict[str, float] | None = None) -> None:
+        self._defaults = default_estimates or {}
+
+    def estimate_physics(
+        self, combination_description: str, metrics: list[str]
+    ) -> dict[str, float]:
+        result = {}
+        for metric in metrics:
+            result[metric] = self._defaults.get(metric, 0.5)
+        return result
+
+    def review_plausibility(
+        self, combination_description: str, scores: dict[str, float]
+    ) -> str:
+        avg = sum(scores.values()) / max(len(scores), 1)
+        if avg > 0.5:
+            return "This concept appears plausible and worth further investigation."
+        return "This concept has significant feasibility challenges."