Add interactive provider installer and fix documentation

- Add `smarttools providers install` interactive guide for installing AI CLIs
- Fix OpenCode install URL (remove .sh suffix)
- Auto-refresh PATH after provider installation
- Fix incorrect npm package names in docs:
  - @anthropic-ai/claude-code (not claude-cli)
  - @openai/codex (not codex-cli)
  - @google/gemini-cli (not @anthropic-ai/gemini-cli)
- Update all docs to reflect clone-first install workflow (not PyPI)
- Add Docker provider installation section to README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/smarttools/cli.py

@@ -365,10 +365,10 @@ PROVIDER_INSTALL_INFO = {
     },
     "opencode": {
         "group": "OpenCode",
-        "install_cmd": "curl -fsSL https://opencode.ai/install.sh | bash",
+        "install_cmd": "curl -fsSL https://opencode.ai/install | bash",
         "requires": "curl, bash",
-        "setup": "Run 'opencode auth' - opens browser for sign-in",
-        "cost": "Free tier (pickle model), paid for premium models",
+        "setup": "Run 'opencode' - opens browser for sign-in",
+        "cost": "Free tier available, paid for premium models",
         "variants": ["opencode-deepseek", "opencode-pickle", "opencode-nano", "opencode-reasoner", "opencode-grok"],
     },
     "ollama": {
@@ -460,6 +460,44 @@ def cmd_providers(args):
             print("-" * 40)
 
             if result.returncode == 0:
+                # Refresh PATH to pick up newly installed tools
+                import os
+                new_paths = []
+
+                # Common install locations that might have been added
+                potential_paths = [
+                    Path.home() / ".opencode" / "bin",  # OpenCode
+                    Path.home() / ".local" / "bin",      # pip/pipx installs
+                    Path("/usr/local/bin"),              # Ollama, system installs
+                ]
+
+                # Also try to get npm global bin path
+                try:
+                    npm_result = subprocess.run(
+                        ["npm", "bin", "-g"],
+                        capture_output=True, text=True, timeout=5
+                    )
+                    if npm_result.returncode == 0:
+                        npm_bin = npm_result.stdout.strip()
+                        if npm_bin:
+                            potential_paths.append(Path(npm_bin))
+                except (subprocess.TimeoutExpired, FileNotFoundError):
+                    pass
+
+                current_path = os.environ.get("PATH", "")
+                for p in potential_paths:
+                    if p.exists() and str(p) not in current_path:
+                        new_paths.append(str(p))
+
+                if new_paths:
+                    os.environ["PATH"] = ":".join(new_paths) + ":" + current_path
+                    print()
+                    print(f"Added to PATH (for this session): {', '.join(new_paths)}")
+                    print()
+                    print("To use in your shell, run one of:")
+                    print("  source ~/.bashrc")
+                    print("  # or start a new shell")
+
                 print()
                 print("Installation completed!")
                 print()