chore: remove deprecated api

[matthewmcneely]

Description

This PR removes the deprecated generics-based API from modusGraph.

It also establishes a mechanism to set the memory cache (ristretto) size when operating in local mode

Checklist

• Code compiles correctly and linting passes locally
• Tests added for new functionality, or regression tests for bug fixes added as applicable

[Copilot]

Pull Request Overview

This PR removes the deprecated generics-based API surfaces and adds a way to configure the embedded database’s in-memory cache size.

• Remove all generics-based CRUD functions (Create, Get, Upsert, Query, Delete) and their internal helpers under api/
• Introduce a cacheSizeMB field in Config and Client, a WithCacheSizeMB setter, and propagate it into posting.Init
• Update tests (package renames, CI invocation) and bump various dependencies in go.mod

Reviewed Changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
zero.go	Dropped deprecated nextUID method
config.go	Added cacheSizeMB, default and WithCacheSizeMB, validation
engine.go	Propagate cacheSizeMB into posting.Init
client.go	Added cacheSizeMB to client options and key, WithCacheSizeMB
live.go	Renamed log keys for data load progress
load_test/live_test.go	Set cache size explicitly in live loader test
namespace_test.go	Renamed test and switched package to modusgraph_test
vector_test.go, engine_test.go	Switched test packages to modusgraph_test
unit_test/…	Removed all tests for the old generics API
api/…	Removed entire api/ folder (deprecated generics API)
go.mod	Bumped versions of dgo, dgraph, and many indirect deps
.github/workflows/ci-go-unit-tests.yaml	Adjusted test invocation

Comments suppressed due to low confidence (3)

live.go:85

• The log field key nquadsProcessed is inconsistent with the variable name nqudsProcessed (missing the 'a'). Consider renaming the variable to nquadsProcessed to avoid confusion.

					"nquadsProcessed", nqudsProcessed,

config.go:14

• [nitpick] Add a comment explaining the purpose and units of the cacheSizeMB field in Config for better maintainability (e.g., "// cacheSizeMB sets the in-memory posting list cache size in megabytes").

	cacheSizeMB        int

load_test/live_test.go:92

• [nitpick] There are no tests validating behavior when WithCacheSizeMB is applied (e.g., zero, default, or negative). Consider adding unit tests to verify that the cache size is correctly passed to the engine and that invalid values are rejected.

	conf := modusgraph.NewDefaultConfig(t.TempDir()).WithLogger(logger).WithCacheSizeMB(0)

[matthewmcneely]

@ryanfoxtyler Can you have a look at this one? Will tag this at v0.2.0 when merged.