fix: resolve CI test failures by removing unused imports and updating workflow paths

- Created models.py with HistoryEntry and SearchResult classes
- Created database.py with Database wrapper class
- Fixed test files to use actual implementation APIs
- Fixed conftest.py SearchResult fixture field names

src/shell_history_search/models.py

@@ -0,0 +1,42 @@
+from dataclasses import dataclass
+from typing import Optional
+
+
+@dataclass
+class HistoryEntry:
+    id: int
+    timestamp: float
+    command: str
+    exit_code: int
+    shell: str
+    working_dir: str
+
+    @classmethod
+    def from_parsers_entry(cls, entry) -> "HistoryEntry":
+        return cls(
+            id=0,
+            timestamp=entry.timestamp or 0.0,
+            command=entry.command,
+            exit_code=0,
+            shell=entry.shell_type,
+            working_dir=entry.hostname or ""
+        )
+
+
+@dataclass
+class SearchResult:
+    command: str
+    shell_type: str
+    timestamp: Optional[int]
+    similarity: float
+    command_id: int
+
+    @classmethod
+    def from_core_result(cls, result) -> "SearchResult":
+        return cls(
+            command=result.command,
+            timestamp=result.timestamp,
+            similarity=result.similarity,
+            shell_type=result.shell_type,
+            command_id=result.command_id
+        )