refactor: Rename package to gitea_mcp_remote and update configuration

Issue #19 - Foundation for Sprint 01: Core Architecture Correction

Changes:
- Renamed package directory: gitea_http_wrapper -> gitea_mcp_remote
- Updated config/settings.py:
  - Made gitea_repo optional (allow None)
  - Added mcp_auth_mode field (default: "optional")
  - Changed HTTP defaults: 0.0.0.0:8080 (was 127.0.0.1:8000)
  - Removed get_gitea_mcp_env() method (no longer needed)
- Updated all import paths throughout codebase
- Updated filtering/filter.py: Changed ValueError to warning when both
  enabled_tools and disabled_tools are specified
- Updated test files with new import paths
- Updated test_filtering.py to test warning instead of ValueError
- Updated pyproject.toml, pytest.ini, and README.md references

All modules preserved - only import paths and configuration updated.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/gitea_mcp_remote/config/settings.py

@@ -0,0 +1,108 @@
+"""Configuration settings for Gitea MCP HTTP transport."""
+
+from pathlib import Path
+from typing import Optional
+
+from pydantic import Field, field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class GiteaSettings(BaseSettings):
+    """Configuration settings loaded from environment or .env file."""
+
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="ignore",
+    )
+
+    # Gitea Configuration
+    gitea_url: str = Field(
+        ...,
+        description="Gitea instance URL (e.g., https://git.example.com)",
+    )
+    gitea_token: str = Field(
+        ...,
+        description="Gitea API token for authentication",
+    )
+    gitea_owner: str = Field(
+        ...,
+        description="Default repository owner/organization",
+    )
+    gitea_repo: str | None = Field(
+        default=None,
+        description="Default repository name (optional)",
+    )
+
+    # HTTP Server Configuration
+    http_host: str = Field(
+        default="0.0.0.0",
+        description="HTTP server bind address",
+    )
+    http_port: int = Field(
+        default=8080,
+        ge=1,
+        le=65535,
+        description="HTTP server port",
+    )
+
+    # Authentication Configuration
+    auth_token: Optional[str] = Field(
+        default=None,
+        description="Bearer token for HTTP authentication (optional)",
+    )
+    mcp_auth_mode: str = Field(
+        default="optional",
+        description="MCP authentication mode: 'required', 'optional', or 'none'",
+    )
+
+    # Tool Filtering Configuration
+    enabled_tools: Optional[str] = Field(
+        default=None,
+        description="Comma-separated list of enabled tools (optional, enables all if not set)",
+    )
+    disabled_tools: Optional[str] = Field(
+        default=None,
+        description="Comma-separated list of disabled tools (optional)",
+    )
+
+    @field_validator("gitea_url")
+    @classmethod
+    def validate_gitea_url(cls, v: str) -> str:
+        """Ensure Gitea URL is properly formatted."""
+        if not v.startswith(("http://", "https://")):
+            raise ValueError("gitea_url must start with http:// or https://")
+        return v.rstrip("/")
+
+    @property
+    def enabled_tools_list(self) -> Optional[list[str]]:
+        """Parse enabled_tools into a list."""
+        if not self.enabled_tools:
+            return None
+        return [tool.strip() for tool in self.enabled_tools.split(",") if tool.strip()]
+
+    @property
+    def disabled_tools_list(self) -> Optional[list[str]]:
+        """Parse disabled_tools into a list."""
+        if not self.disabled_tools:
+            return None
+        return [tool.strip() for tool in self.disabled_tools.split(",") if tool.strip()]
+
+
+def load_settings(env_file: Optional[Path] = None) -> GiteaSettings:
+    """
+    Load settings from environment or .env file.
+
+    Args:
+        env_file: Optional path to .env file. If not provided, searches for .env in current directory.
+
+    Returns:
+        GiteaSettings instance with loaded configuration.
+
+    Raises:
+        ValidationError: If required settings are missing or invalid.
+    """
+    if env_file:
+        return GiteaSettings(_env_file=env_file)
+    return GiteaSettings()